Can not connect to target

[triballo]

Hi,
I have a problem in my board mod, when I try to connect to the board ST-LINK tool it returns the error "Can not connect to target!".
As a programmer I am using a st-link v2 and the board is a new YST-DXT-J20 V 5.1.
I have checked the position of the PINs a thousand times, I have also tried both procedures both with 3.3v and without battery and without 3.3v but with battery. Some advice?
Please, I'm desperate

[Candas1]

Hi, This is a different board with a different chip, this firmware won't work.
I had collected some a the different boards that I encountered with a link to the right firmware if one is available:
https://docs.google.com/spreadsheets/d/1Vs3t2W8_z7E93Ij0pwx_cKzxzKSvjW1n1t_40CXV3ik/edit#gid=0

This is probably the firmware you need, and there are instructions how to flash it:
https://github.com/cloidnerux/hoverboard-firmware-hack