I don’t see problem to use UART AT command port:
ati3
Manufacturer: Sierra Wireless, Incorporated
Model: WP7702
Revision: SWI9X06Y_02.22.12.00 eaf79c jenkins 2019/04/24 18:48:27
IMEI: 352653090002874
IMEI SV: 3
FSN: VU735370521401
+GCAP: +CGSM
OK
at+ipr?
+IPR: 115200
OK
ati8
Legato Ver: 18.09.4.c964f253_3ba44b6732e03bacfafb714c4463754d
Yocto Ver: SWI9X06Y_02.22.04.00 2020-06-18_02:43:58
OS Ver: Linux version 3.18.44 (jenkins@CAKEL-EV-ALBLD2) (gcc version 6.2.0 (GCC) ) #2 PREEMPT Thu Jun 18 02:45:08 UTC 2020
LK Ver: 1.3.0_da731a7332
RootFS Ver: SWI9X06Y_02.22.04.00 2020-06-18_02:43:58
UserFS Ver: unknown
MCU Ver: 002.011
It depends on your network carrier.
If it is not ATT or verizon, you can use generic one.
Please note that you can still use WP77 FW, as inside your FX30, it is still a WP77 module.
But people will prefer to use FX30 FW for FX30 device as it contains extra feature.
I still can’t seem to fix the problem, I’m not used to using these tools. is it possible that i give you Teamviewer access to my computer so that you can see with me to update the firmware? if so, we can make an appointment.