Flash 26X QMK firmware - gloryhzw/qmk_tool GitHub Wiki

Follow CalcProgrammer1's video guide https://www.youtube.com/watch?v=aUiKHdI5Vk8

Just use the jumploader here: https://cdn.discordapp.com/attachments/817767064311431189/1027232337584459836/Pre-Compiled_Jumploaders.zip

Sonix flasher https://github.com/SonixQMK/sonix-flasher/releases/tag/v0.2.4