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You need to install "er9x for Mega128" on your radio, not ersky9x. You can download the file at http://www.er9x.com João I want to use mavlink, I omly have 9x board :( er9x m128 download from er9x.com when install, thr sw and ail sw don't work and no option Frsky mod done I use er9x r818 ...

It will depend on whether you have the original M64 processor, or a M128 (or M2561) processor. There isn't enough flash memory on the M64 to add this, but it is available on the M128 (or M2561). More recent 9X Txs do have the M128 (the M2561 is only there if you change it yourself!). Mike. Hi Mike,...

It will depend on whether you have the original M64 processor, or a M128 (or M2561) processor. There isn't enough flash memory on the M64 to add this, but it is available on the M128 (or M2561). More recent 9X Txs do have the M128 (the M2561 is only there if you change it yourself!). Mike. Thank yo...

Hi MikeB, great work
I have fs th9x without eysky9x board, I only have djt module and d4r ii rx, if I do frsky telem mod, install your hex file on radio and arduino, it will work without ersky9x board?