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OS Update Mini Guide:
--Enter Fastboot mode (hboot)
Press and hold power & volume up buttons until the screen turns black then release both buttons and quickly press & hold volume down button only. This will get you to hboot

--Unlock the bootloader - (S-ON doesn't need to be OFF) [This can be tricky!]
fastboot flashing oem unlock
fastboot flashing unlock
fastboot flashing unlock_critical
fastboot flash unlocktoken Unlock_code.bin
fastboot reboot

--Install TWRP (test all version starting from the newest)
fastboot flash recovery twrp-3.3.1-0-m8.img
fastboot reboot

--Install the OS and Google Play
Enter TWRP recovery
Copy the lineage-20.0 rom and the BiTGApps zip files to the phone
Do a clean up, wipe the previous OS
Then install the copied 2 zip files.

The two files that I downloaded are these two:
BiTGApps-arm-13.0.0-v4.8-CORE
lineage-20.0-20231020-UNOFFICIAL-m8

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NETWORK Technology:
GSM / HSPA / LTE
2G bands GSM 850 / 900 / 1800 / 1900
3G bands HSDPA 850 / 1900 / 2100
4G bands 2, 4, 5, 7, 17
Speed HSPA 21.1/5.76 Mbps, LTE Cat4 150/50 Mbps

This is a 4G phone with limited bands, but should work in today's (2025) att network. This is the spec for an ATT phone. There are many variations.
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PS. This is kind of hard, but it's a very fast and easy process.
PPS. You can enter Fastboot using "adb reboot bootloader", but you need to install the HTC driver, which in my opinion is not worth the time.