Right, let’s get back to basics. What radio do you have? When you looked in Betaflight did you check the channel order in BF matched the channel order in the transmitter? You check that by moving the sticks whilst in the Receiver tab, after binding, to check that they work the right way.
Spektrum uses the channel order TAER (Throttle,Aileron,Elevator,Rudder) but other companies use AETR (Aileron, Elevator,Throttle,Rudder) and BF sometimes sets that as the default order.
You can change it by selecting the correct order in Betaflight.
If you saved the original set up, all you need to do is re flash the correct release of BF, e.g. BF 3.5.7, then copy the CLI from the .txt file and paste it onto the CLI window, hit save. You can use “restore” button in the main BF screen to re set the other stuff like modes. You now can’t do that because you haven’t saved the defaults.
Have you done a full chip erase and firmware flash in Betaflight? If not then it’s not lost the original settings, you just unbound it or changed something that stopped it seeing the TX.
Original CLI dump is here-
https://www.rcgroups.com/forums/showpost.php?p=39156820&postcount=2
You should watch this too-