any vendor Using LR1121 with ESP8285?

[nexus5x11]

looking for a firmware that matches 900mhz FCC with LR1121 and ESP8285

[OpenUAS]

NAFAIK but maybe a C3 ESP32 and a LR1121 will do for example https://www.radiomasterrc.com/products/dbr4-dual-band-xross-gemini-expresslrs-receiver. BTW C3 is pin compatible with 8285 only crystal issues 40 instead of 26 but you could try to swap the chip. But maybe re-phrase what you really try achieve, so one could have given better advise to you. Also more response luck in the ELRS Discussions IMHO, not in this ELRS hardware issue queue... since likely not read by many.