Sorry to ear about your problem with kickstart sales.
I bought two Ender 3 from Bangood: one Ender 3 and another Ender 3 Pro.
When I received my Ender 3 Pro i came with the Y rail smashed during the transport.
I always take pictures of machines I received from international companies and during my pictures section I found the y Rail with problems. I sent to the customer support the explanation and the issue it is casuing to me and they sent me a new set of rollers and the Y Rail to replace. It is working fine.
I guess you mean this one https://www.youtube.com/watch?v=jWjK9ECebMA
A few things that might be important
don't use a huge SD card. I think up to 32GB is supported, but recommend 8GB or 16GB
fresh format FAT32, don't put anything else on the card
only copy the .bin file to the card
get firmware direct from creality
At time of writing the latest is "Ender-6 _32bit V184.108.40.206-BLTouch"
turn off printer, insert card, turn on printer, let it finish and show the menu
remove card, delete the .bin file
to save BL Touch measurements, need to keep an SD card in the slot (can use the same one). settings will get saved in file eeprom.dat
unplug stock Z end-stop
when BL Touch is correctly installed, it will light up and click out and in a couple times as the progress bar is loading on the screen
you can see if your firmware is working at all by starting the printer with BL Touch completely unplugged. the menu should still load, but turn it off right after! don't let it home since you have no Z end-stop. if the problem is only when plugged in, then the cause is your wiring. this is an easy check to start with
I bought the creality bltouch kit linked here(https://uk.banggood.com/Creality-3D-Upgraded-Version-BL-Touch-Heated-Bed-Auto-Bed-Leveling-Sensor-Kit-For-Creality-V1-Mainboard-Including-Ender-3-or-Ender-3s-or-Ender-3-Pro-or-CR-10-3D-Printer-p-1435882.html?cur_warehouse=UK&rmmds=search), but didn't realise that I had a V2 motherboard. So I tried using the extension cable with some gpio jumper cables to attach it to the motherboard. First print worked out fine, but the bltouch was very intermittent, sometimes working sometimes not. So I tried using the transfer board installing the bltouch like you would with a V1 motherboard. I noticed that the firmware file said temporary on it, but installed it anyway thinking 'It can't be that bad'. It was that bad. The firmware seems to randomly detect me clicking on the knob every 30 seconds or so, I have been very lucky so far as it hasn't by mistake clicked on anything which would have broken the printer. But even worse, the bed levelling doesn't really work at all. the probing runs fine, but the printer then proceeds to completely ignore it. I can't find a previous update anywhere, and I know that technically I shouldn't be using the transfer board with the V2 motherboard and I would be absolutely clueless trying to make my own firmware, but I think that the firmware should be a lot less janky for it to be the only available version on the download page (creality.com/download) supporting the transfer board on the V2 motherboard. It would be amazing if someone could send a previous, working version of the firmware or if I'm doing something wrong, pointing that out to me.