OK I TRIED your zip file and a similar named file from meshtastic flasher and i still got boot loop.. what da?
the incorrect firmware overwrote important flash partitions happened here, so the normal startup fails shortly after Bluetooth initialization. When the wrong Meshtastic/Rak UF2 image is pushed to the Solar Node, then it happens.
Enter the DFU mode (double-tap reset so you see the “XIAO-BOOT” drive)> use a flash erase UF2 (It will wipe the flash before loading the correct firmware)>re-flash the proper bootloader (if needed)>he correct Meshtastic application UF2. you should follow this Get Started with SenseCAP Solar Node | Seeed Studio Wiki?
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Hi there,
Yes, It took a couple tries to get it clean , before the Flasher would write a good image, once it did , everything was per the Wiki, AOK!
GPS is working Also. 
HTH
GL 
PJ 