I'm on eu stable 12.5.2 and I want to update to 12.5.3. I've downloaded latest twrp and I've also downloaded and copy the zip stable rom on internal memory. But when I boot to twrp via pc, I can't find the zip file. Twrp probably doesn't see my internal memory?update is easy:
download latest 3.5.1 TWRP and boot on it via your computer .
Once in TWRP install latest rom zip.
Reboot system (take longer than usual) and tht's all.
Twrp will be flashed and ready for next OTA.