Failed to migrate pi air from 3B mini to 3A+

Hi community,

I’ve been using openhd with a 3B+/AC56 on ground side and a 3B mini/AC56 on air side but due to temperature issue I just replaced the 3B mini by a 3A+ but I’m getting some troubles.

The ground and the air are booting normaly (green DELs blink) , both AC56 turn on (blue DELs light up fix), OSD appears on screen but unfortunatly Tx & Rx powers are staying at -127 dB

I was wondering if I have not to restart from scrach with some SDcards with a new image of OpenHD ? Maybe there’s something settled by the anciente configuration that is blocking the 3A+ ?

Thanks for your help and merry christmas !!