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We haven’t figured out why we’ve had such a high failure rate with the LTE-M XBee3’s. It’s pretty discouraging.
I know there was an upload issue with the outputs you tried to post. (I think our wonderful webmaster is working to allow ino files to be posted.) But from what you did post, if TinyGSM was able to tell you that the modem was a “u-blox SARA-R410M-02B” it can only have done that if it succeeded in asking the modem for its name. That means your modem is definitely *not* completely broken and it must have an active bootloader even if XCTU can’t find it.
And what I said above about the assoc/rssi lights only applies if you’re running the XBee3 in “transparent” mode. You’re running in “bypass.” The assoc and RSSI lights do not work in bypass mode. The assoc light will probably never start to blink even after you’re connected and the RSSI light will stay off.