Help needed, 2.7.21 power-safe firmware for Heltec v4

Hi!

After Heltec released v4.3 revision , it was impossible to use power-saving firmwares because 4.3 does work properly only on 2.7.21 or higher

Can anybody help with making one m1nl firmware rewriting existing ones?

like here (m1nl above) https://mrekin.duckdns.org/ or

topic here https://github.com/meshtastic/firmware/pull/7121

Thanks a lot