How old is your Tasoller? If you bought it new when did you buy it? If it was purchased in 2022 or later then you shouldn't need to use a UART cable to flash the firmware.
If it's older than that and still on Factory 1.0 firmware, then follow the DAO guide to get on 2.0 https://www.dj-dao.com/en/support/11.html
If your Tasoller is newer (or after you've done the UART flash if it's older) grab the custom firmware files from here https://pixeldrain.com/u/v28yFBTZ
There's a readme in the zip that'll tell you exactly what to do, with only the regular USB cables being required.
You can use the fufubot segatools included with the custom firmware and it should just work in its default configuration, though I personally recommend using;
segatools: https://gitea.tendokyu.moe/Dniel97/segatools/releases
chuniio for tasoller: https://gitea.tendokyu.moe/Scribbler/chuniio-tasoller/releases
and follow the instructions for the dlls herehttps://gitea.tendokyu.moe/Scribbler/chuniio-tasoller#configuration
and as my user box to the left says, check my profile for useful links