My first transmitter is a Hobby king 6v2. Then they gave me a Turnigy 9x, and I bought a cheap Turnigy 9xr with a 900 MHz module. All receivers are suitable for these transmitters. I have 8 receivers. I repaired 5 receivers with a replacement chip. Experience of use - 20 years. Turnigy replaced the microchips in the transmitters with more powerful ones. I flashed them to the latest firmware version with ELRS support. You asked for advice, and I gave it to you. The chip is sold on Aliexpress, inexpensive, for 5 pieces. Or ask someone for a Hobby king 6v2 or Turnigy 9x receiver.,I'm not interested in this topic anymore. I shared my experience of ownership and renovation. Goodbye.