Okay, gimme a few. Gotta start up my ancient laptop and throw it on the otg drive, upload it to gdrive, and I'll post the link here.
Edit: Link Posted. https://drive.google.com/drive/folders/1LFEy0q58Dke1t_Uh7bdTxdp-wY0YFs_Z?usp=sharing
Modem_a/_b are fastboot flashable. Modemst1/st2 have to be flashed via fastbootd.
Fastboot flash modem_a modem_a.img
Fastboot flash mkdem_b mkdem_b.img
Fastboot reboot fastboot
Fastboot flash modemst1 modemst1.img
Fastboot flash modemst2 modemst2.img
These can also be replaced in payload.bin firmware fastboot roms. Just extract via payload dumper, place these modem files into the rom, then fastboot flashall in fastbootd.
There is typo in the 2nd fastboot cmd.
I got the following error when fastboot flash modemst1/2...
fastboot flash modemst1 modemst1.img
target reported max download size of 805306368 bytes
sending 'modemst1' (3072 KB)...
OKAY [ 0.077s]
FAILED (remote: Flashing is not allowed for Critical Partitions