Install OpenWrt on Tenda ac9

Hello
How can I install OpenWrt on my Tenda ac9. I only found one file .trx and the firmware checksum of my download matches the checksum statedn't on the download site!
thanks

See this old thread
https://forum.openwrt.org/t/installing-lede-on-a-tenda-ac9/727

https://openwrt.org/toh/hwdata/tenda/tenda_ac9

donc si j'ai bien compris mieux vaut éviter de l'installer dessus ?
merci

so if I understood correctly better to avoid installing it?
thank you

@Karim, welcome to the community!

Please provide English translations.