Lopy4 Guru meditation error

[bjsi9]

Hi, i have a LoPy4 with firmware 1.17.3.b1 attached to a Expansionboard v2.1A. I have a code that worked fine on SiPy, but after transfer to LoPy4 i get this error.
Note: this error comes with or without any pins connected to the expansionboard.
If you want the main.py, please provide me with a mail i can sent to.
Thank you

Update: i have tried downgrading to: 1.17.2.b1, 1.17.0.b1 and 1.16.0.b1
The dumb is from 1.17.3.b1:

Update:
Downgrading to updater tool: 1.13.1.b5 - Same chrashes
Downgrading firmware to: 1.15.0.b1 on SiPy and LoPy4 - same chrashes
FTP overwrite boot.py and main.py to standard settings (factory default) - same chrashes
Switch expansionboard, USB port and cable - same chrashes

I have two LoPy4's and two SiPy's. Any suggestions are welcome. Dont care about custom code any more, just need to work again as from factory. Thanks

Guru Meditation Error: Core  0 panic'ed (InstrFetchProhibited)
. Exception was unhandled.
Register dump:
PC      : 0x00000000  PS      : 0x00060030  A0      : 0x8011855d  A1      : 0x3ffbd650
A2      : 0x00000000  A3      : 0x00000037  A4      : 0xffffffa2  A5      : 0x3fbc0af4
A6      : 0x00000008  A7      : 0x00000000  A8      : 0x8012382c  A9      : 0x3ffbd640
A10     : 0x3fbc0b10  A11     : 0x00000037  A12     : 0xffffffa2  A13     : 0x3ffbd6e4
A14     : 0x7777395d  A15     : 0x7777395d  SAR     : 0x00000010  EXCCAUSE: 0x00000014
EXCVADDR: 0x00000000  LBEG    : 0x4009b351  LEND    : 0x4009b385  LCOUNT  : 0xffffffff

Backtrace: 0x00000000:0x3ffbd650 0x4011855a:0x3ffbd670 0x40119567:0x3ffbd740 0x4012faf5:0x3ffbd760 0x40131657:0x3ffbd7b0

================= CORE DUMP START =================
PDUAAA8AAABsAQAA
WNj7P5DV+z9Q2Ps/
sNb7P/DX+z9y7PondFL8P3RS/D9Y2Ps/bFL8PwIAAADowfs/6MH7P1jY+z8AAAAA
FwAAAFTI+z93aWZpAP8nK+eeG3KnY8AAAAAAAFDY+z8AAAAAIAAGABcAAAABAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAADkaf0/TGr9P7Rq/T8AAAAAAAAAAAEAAAAAAAAA
V1pAPwAAAACMuglAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAG/yAQ==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RGP9P8Bh/T88Y/0/
wGH9P9Bi/T/sMinvqFD8P9hd/T9EY/0/oFD8PxkAAADC8Pr7BB9CHkRj/T8AAAAA
AAAAAEBf/T9JRExFAPGh2Idn1Ri0T5UAAQAAADxj/T8AAAAAIQAGAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAADkaf0/TGr9P7Rq/T8AAAAAAAAAAAEAAAAAAAAA
V1pAPwAAAACMuglAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAImr/w==
UDQIQOzsFEAwDAYAQMoIgIBi/T8gAAAAAQAAACAAAABcp/w/mFL8PzxQ/D+Yp/w/
AAAAAAAAAAD///9/m7MIgECq/T8DAAAAIwAGAAAAAACAYv0/IAAAAAAAAAAAAAAA
AAAAAEk2CEBAqv0/qNgIQPCd+j8AAAAAAAAAAAAAAAD//z+zAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAP//P7MAAAAAAAAAAAAAAAAAAAAAoGL9PwAAAAABAAAA
AAAAAAQZ/D+YUvw/PFD8PwAAAADQYv0/AAAAAAAAAAAEGfw/AAAAAAAAAAAAAAAA
AQAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAANxi/T8AAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=
0F39P1Bc/T/IXf0/
UFz9P2Bd/T/7N8DzTGP9P6hQ/D/QXf0/oFD8PxkAAABZOtWhuD9+EtBd/T8AAAAA
AAAAAMxZ/T9JRExFAG/0AWWZEVAsQMAAAAAAAMhd/T8AAAAAIwAGAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAADkaf0/TGr9P7Rq/T8AAAAAAAAAAAEAAAAAAAAA
V1pAPwAAAACMuglAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAGa3XA==
UDQIQOzsFEAwAAYAQMoIgBBd/T8gAAAAAQAAAAAAAABcp/w/lFL8PzxQ/D94p/w/
8Fz9PwAAAAAAAAAAAAAAAPBT/T+4GPw/IAYGAAoAAADfgw6A0Fz9PwAAAAAAAAAA
AAAAAEk2CEDwU/0/qNgIQICY+j8AAAAAAAAAAAAAAAD//z+zAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAADwU/0/uBj8PyAGBgAAAAAAMF39PwAAAAAAAAAA
AAAAAFyn/D+UUvw/PFD8PwAAAABgXf0/AAAAAAAAAAAEGfw/AAAAAAAAAAAAAAAA
AQAAAAAAAAAEAAAAAQAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAGxd/T8AAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA==
HH37PxB7+z8Uffs/
EHv7P7B8+z/qGAAAWGv7P7xk/T8cffs/jFD8PxMAAAAgbf0/IG39Pxx9+z8AAAAA
BgAAABhv+z9TaWdmb3gAAB6wGoAQfvsAAAAAABR9+z8AAAAAIQAGAAYAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAADkaf0/TGr9P7Rq/T8AAAAAAAAAAAEAAAAAAAAA
V1pAPwAAAACMuglAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA==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UGv7P1Bp+z9Ia/s/
UGn7P+Bq+z/qGAAA9Ff9PyR9+z9Qa/s/jFD8PxMAAAAgbPs/AQAAAFBr+z8AAAAA
BgAAAExh+z9Mb1JhAB8QgEBs+z8EDgAAAQAAAEhr+z8AAAAAIQAGAAYAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAADkaf0/TGr9P7Rq/T8AAAAAAAAAAAEAAAAAAAAA
V1pAPwAAAACMuglAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA==
UDQIQLDJCEAwDAYA/h8QgBBq+z/qGAAAmFL8PwQZ/D8BAAAAAAAAAAAAAACwyQiA
8Gn7PwEAAADqGAAAUGv7PwEAAAD+AAAAIwAGAAAAAAAApvg/AAAAAAAAAAAAAAAA
AAAAAEk2CEABAAAAqNgIQACm+D8AAAAAAAAAAAAAAAD//z+zAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAFBr+z8BAAAA/gAAACMABgAAAAAAMGr7P3xl/D8AAAAA
BBn8PwEAAAAAAAAAAAAAAAAAAADgavs/AAAAAAAAAADgavs/AAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAApvg/AAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAIZvw/CwAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA7Gr7PwAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
7Ff9P4BW/T/kV/0/
gFb9P4BX/T/qGAAAPGb9P1hr+z/sV/0/jFD8PxQAAAAAAAAAAAAAAOxX/T8AAAAA
BQAAAOhP/T9TZXJ2ZXJzAAAAAAAAAAAAAQAAAORX/T8AAAAAIQAGAAUAAAAAAAAA
HNv7PwAAAADgNw1AAAAAAAsAAADkaf0/TGr9P7Rq/T8AAAAAAAAAAAEAAAAAAAAA
V1pAPwAAAACMuglAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA==
UDQIQLDJCEAwDAYAA9INgEBX/T/qGAAAmFL8PwQZ/D8BAAAAAAD/AAAAAP+wyQiA
IFf9PwEAAADqGAAA7Ff9PwEAAAD+AAAAgKn8PwAAAABUkQ6AAFf9P6yyCUDasglA
/////0k2CEABAAAAqNgIQKCS+j8AAAAAAAAAAAAAAAD//z+zAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAABACABcAAAAA/gAAAFD/+j8AAAAAYFf9PwAAAAAAAAAA
BBn8PwEAAAAAAP8AAAAA/wAAAACAV/0/AAAAAAAAAAAAAAAAAQAAAE5Y/D8AAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAjFf9PwAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAA=
NGb9PwBO/T/gT/0/
AE79P4BP/T/3GAAAJFT8P/RX/T80Zv0/jFD8PwcAAADIsf0/yLH9PzRm/T/Asf0/
EgAAAORB/T90aVQAdAC9kg98IPoH11IA////f+BP/T8AAAAAIQAGABIAAAABAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAADkaf0/TGr9P7Rq/T8AAAAAAAAAAAEAAAAAAAAA
V1pAPwAAAACMuglAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAPJv8g==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sKn9PwCw/T9nGQAAlFD8Pzxm/T8cVPw/jFD8PxQAAADkbvs/5G77PxxU/D8AAAAA
BQAAAHCA/T9NaWNyb1B5AAAAAAAAAAAAAQAAAGyw/T8AAAAAIQAGAAUAAAAAAAAA
AAAAALxf/D8AAAAAAAAAAAAAAADkaf0/TGr9P7Rq/T8AAAAAAAAAAAEAAAAAAAAA
V1pAPwAAAACMuglAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAgAAAA==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tGT9P/B3/T9Ief0/
8Hf9P+B4/T/pGAAAJH37P5RQ/D+0ZP0/jFD8Pw8AAACAbv0/gG79P7Rk/T94bv0/
CgAAAExv/T9UbXIgU3ZjAHZ6wNnHNnYAAAAAAEh5/T8AAAAAIQAGAAoAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAADkaf0/TGr9P7Rq/T8AAAAAAAAAAAEAAAAAAAAA
V1pAPwAAAACMuglAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAPiW6A==
UDQIQPnWCEAwAgYAAAAAALB4/T8BAAAA6RgAAAAAAACkUvw/nFL8P+gYAAD51giA
kHj9PwAAAAAEGfw/AAAAAAAAAAAAAAAAAAAAACAAAAC+ygiAcHj9P6yyCUDasglA
AAAAAEk2CEAAAAAAqNgIQAC0+j8AAAAAAAAAAAAAAAD//z+zAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAABcAAAAAAAAA4Hj9PwAAAAAAAAAA
AAAAAMYFAABE5v0/xQUAAAAAAACkUvw/nFL8P9YHAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAADseP0/AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAA=
pGf9P0DE/T/4xf0/
QMT9P5DF/T8MtnNjCDv9PwTM/T+kZ/0/HFD8PwUAAADQs/0/0LP9P6Rn/T/Is/0/
FAAAAPy5/T9ldmVudFRhc2sAVphBgGAAAAAAAPjF/T8AAAAAIQAGABQAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAADkaf0/TGr9P7Rq/T8AAAAAAAAAAAEAAAAAAAAA
V1pAPwAAAACMuglAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAKThuw==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ADv9P3A5/T/4Ov0/
cDn9P5A6/T/APSCRfED9P6xn/T8AO/0/HFD8PwEAAAB4bf0/eG39PwA7/T9wbf0/
GAAAAPw2/T9pcGMwAPjP84zL+6ABJRYAAAAAAPg6/T8AAAAAIQAGABgAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAADkaf0/TGr9P7Rq/T8AAAAAAAAAAAEAAAAAAAAA
V1pAPwAAAACMuglAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAMA0GQ==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dED9P8A+/T9sQP0/
wD79PwBA/T/SbBm4oFH7Pwg7/T90QP0/HFD8PwEAAADQbf0/0G39P3RA/T/Ibf0/
GAAAAHA8/T9pcGMxAFaLR0Ua7oF5NHkAAQAAAGxA/T8AAAAAIQAGABgAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAADkaf0/TGr9P7Rq/T8AAAAAAAAAAAEAAAAAAAAA
V1pAPwAAAACMuglAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAP3y8g==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mFH7PwBQ+z+QUfs/
AFD7PzBR+z+lpaWlXDX9P3xA/T+YUfs/HFD8PwQAAAAIR/s/CEf7P5hR+z8AR/s/
FQAAAJRH+z9wbVQApaWlpaWlpaWlpaUA////f5BR+z8AAAAAIQAGABUAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAADkaf0/TGr9P7Rq/T8AAAAAAAAAAAEAAAAAAAAA
V1pAPwAAAACMuglAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAADMzAw==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VDX9P8Az/T9MNf0/
wDP9P+A0/T/QCFc4JFD8P6BR+z9UNf0/HFD8PwMAAAC0a/0/tGv9P1Q1/T+sa/0/
FgAAAFAp/T9lc3BfdGltZXIANv7ZTfMAAAAAAEw1/T8AAAAAIQAGABYAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAADkaf0/TGr9P7Rq/T8AAAAAAAAAAAEAAAAAAAAA
V1pAPwAAAACMuglAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAMnKpw==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/Mv9P1Dj/T9o5f0/
UOP9PwDl/T+lpaWlrGf9PyRQ/D/8y/0/HFD8Pw4AAAAsxv0/LMb9P/zL/T8kxv0/
CwAAAGzN/T9JUlFzAKWlpaWlpaWlpaUAAQAAAGjl/T8AAAAAIQAGAAsAAAAAAAAA
AAAAAJzk/T8AAAAAAAAAAAAAAADkaf0/TGr9P7Rq/T8AAAAAAAAAAAEAAAAAAAAA
V1pAPwAAAACMuglAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAqWlpQ==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================= CORE DUMP END =================

[jmarcelino]

Hi @bjsi9

Does the code do anything visible before this crash?

Have you tried erasing the erasing the filesystem with os.mkfs('/flash') and re-uploading your code?

If so I'd appreciate if you could email your main.py to me at jmarcelino@pycom.io

Thank you.

[bjsi9]

@jmarcelino Thank you for response.

I have "erased the flash file system" via the Updater tool. I cannot do it manually in the line command, because the error keeps re-displaying.
It did not help to erase the filesystem. This is what the code does before the chrash:

rst:0xc (SW_CPU_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:1
load:0x3fff8028,len:8
load:0x3fff8030,len:1728
load:0x4009fa00,len:0
load:0x4009fa00,len:14584
entry 0x400a059c
MicroPython v1.8.6-849-83e2f7f on 2018-03-19; LoPy4 with ESP32
Type "help()" for more information.
>>> Guru Meditation Error: Core  0 panic'ed (InstrFetchProhibited)
. Exception was unhandled.
Register dump:```

[bjsi9]

@jmarcelino Hi, i've just tried with a new LoPy4. Using FTP instead of Atom to upload. Same problem.
I'm gonna sent my main.py to you now.
Thank you!

[bjsi9]

@jmarcelino
So this is what i know so far:

• New Lopy4 (from package) updated to latest stable firmware connected to Pymakr. No error.
• Upload my code, the guru meditation error comes
• Upload and overwrite the main.py back to standard (empty). Reboot. Still dumb error.

[bjsi9]

@jmarcelino I managed to sneak in the os.mkfs('/flash') command.
But still no luck. see pictures:

[robert-hh]

@bjsi9 Does that also happen with the safe boot (P12 at 3.3v during reset)?

[bjsi9]

@robert-hh Hi, no error if i safe boot!
But when i remove the jumper, the errors comes back.
Also after reset.

[robert-hh]

@bjsi9 That means, like you suspekt, the crash is caused by something in main.py, or by the attempt of accessing main.py. Safe boot does not run boot.py or main.py.

[bjsi9]

@robert-hh Thanks, good point.
Here is fresh pictures of what is in the boot and main, that still gives me error:

[robert-hh]

@bjsi9 main.py looks definitely uncritical. I'm a little bit thinking about boot.py, because setting REPL to UART0 is the default. I have to check this evening back home what I have on my devices. But you could try to comment that out. During safe boot you will still have access to the file system via ftp. I would not use Pymakr for that basic debug stuff. It has its own complications.

[bjsi9]

@robert-hh Hi, the boot.py is the same code as on my SiPy. And that has no error.

[bjsi9]

I just updated my Sipy (which have been working for half year). And now i have the exsact same problem with Guru error.
(i dont know which firmware was on before the upgrade, i will try to find out)
Update: its 1.15.0.b1

[robert-hh]

@bjsi9 Looking into the sources, this is the code in the embedded _boot.py, which is executed on any boot, even the safe boot:

# _boot.py -- always run on boot-up, even during safe boot
import os
from machine import UART
os.dupterm(UART(0, 115200))

So this code is not required in boot.py, and you can drop it. Do the file copying with ftp. The youre sure about what you get.

[robert-hh]

@bjsi9 Duplicating the dupterm code in boot.py does not hurt, at least in my test with a FiPy and a WiPy.

[bjsi9]

Hi @robert-hh , still no luck.

The LoPy4 boots, and are ready for commands. But after some seconds it chrashes with the Guru error. Then it boots again, and chrashes again.. and so on.
Very sad story for my 2 Sipy's and 2 LoPy4's. But i'm sure we will find a solution at some point. Any suggestions are welcome :)

[bjsi9]

New update:
I dont care about my code anymore, i just want the LoPy4 to work as from factory.
I have tried with a new expansionboard, LoPy4 with erased filesystem and downgrading to 1.15.0.b1.
Still chrash chrash chrash every 2 seconds.
No luck after manually flash-reset, or FTP upload standard boot and main.

Safe boot dosent chrash.

[robert-hh]

@bjsi9 That's strange. I have a Lopy here running since 5 weeks in a row as Lora nanogateway, and some Fipy's for testing, but they never crashed.

• When crashing, do your devices run code or are they just waiting in the REPL prompt?
• Do you always connect the devices in the same way - same expansion board, same cable, same USB port?

[bjsi9]

@robert-hh Hi, yes its very strange. I have also some Sipy's for testing, never had any problems. But after upgrade they chrashes all the time, even when downgrading and flash-reset.

• The device starts up, and waits in the prompt with: >>>>
  After som seconds, it chrashes.
• I have two expansionsboard, and tested with different USB ports also. Its the same cable i've used since i started working with pycom device the past year.

Remember: the safe boot works

[robert-hh]

@bjsi9 Looking at the code, this is hard to understand:
With safeboot, only _boot.py is executed.
with normal boot, _boot.py, boot.py, _main.py and main.py are run (in that order). That is mostly th whole difference. This is the section in the file mptask.c, which I'm talking about (line 282 ff):

    if (!safeboot) {
        // run boot.py
        int ret = pyexec_file("boot.py");
        if (ret & PYEXEC_FORCED_EXIT) {
            goto soft_reset_exit;
        }
        if (!ret) {
            // flash the system led
            mperror_signal_error();
        }
    }

    if (!safeboot) {
        // execute the frozen main first
        pyexec_frozen_module("_main.py");

        // run the main script from the current directory.
        if (pyexec_mode_kind == PYEXEC_MODE_FRIENDLY_REPL) {
            const char *main_py;
            if (MP_STATE_PORT(machine_config_main) == MP_OBJ_NULL) {
                main_py = "main.py";
            } else {
                main_py = mp_obj_str_get_str(MP_STATE_PORT(machine_config_main));
            }
            int ret = pyexec_file(main_py);
            if (ret & PYEXEC_FORCED_EXIT) {
                goto soft_reset_exit;
            }
            if (!ret) {
                // flash the system led
                mperror_signal_error();
            }
        }
    }