@Gijs Hello, I found the "transfer" button on the original owner "Device" interface. But as he deleted it, the device is viewable in "Deleted Device" not in "Device" and there is no such a transfer button for Deleted Device. I tried with the Deleted Device PAC and get : "CRA rejected the modem ownership transfer: The device with id 00000000 can't be registered for the moment, please contact your device vendor.". (note the strange 00000000 instead of the PAC i gave) Another strange thing : the Deleted Device PAC is "E9--------------" (with - not to write the real one :-)) while the ubinascii.hexlify(Sigfox().pac()) gives "82--------------" maybe the issue is there? Any idea?

Solution from link that you send solved my issue. Thank you.

@xykon said in Modem's radio showphy, all zeros, is bad?: print(lte.send_at_cmd('AT+CFUN?')) the print(lte.send_at_cmd('AT+CFUN?')) reported 4 before the attach and 1 after lte.iccid() reports: 8944501810180163302" i noticed a funny double-quote at the end but it did that before the modem firmware update and worked fine

ouch... In Pycom's webpage, the last version of DFU that is writen is pytrack_0.0.4.dfu and I do not download because it's the version that I have now: "The latest firmware is v0.0.4. The DFU file can be downloaded from the links below:" But, if open the link, the version is 0.0.6.... Sorry, it's my fault! Works again!