[Bug] Womier K87 error firmware "Protocol Handshake Error!"

[AleksandrPU]

Describe the Bug

An error occurred while flashing the keyboard.
I used an auto-compiled firmware #562 from a branch "k87_backlight_test".
Used program XONiX USB MCU ISP Tool version 2.3.2.1 with parameters VID = 320F and PID = 502A.
The firmware ends with an "Protocol Handshake Error!" in the log:

Load File...
---------------------------------------
Bin File Check Sum : DB60
Open USB HID Device...
----VID: 320F PID: 502A----- No. 001
Command Header :Get Firmware Version (0x01) Failed!!

System Information

• Keyboard: Womier K87
  • Revision (if applicable): 0104
• Operating system: Windows 10
• AVR GCC version:

• ARM GCC version:

• QMK Firmware version: Compile Firmware # 562

• Any keyboard related software installed?
  • AutoHotKey
  • Karabiner
  • Other:

Additional Context

[AleksandrPU]

I discovered that the program "WOMIER-RDR-K87T-K87-mechanical keyboard microsoft" can switch the keyboard to bootloader mode.
I downloaded this program from the site https://www.xvxchannel.com. If you press the button "Access Device" in this program, the keyboard will go into the bootloader mode. This changes the keyboard VID/PID to 0C45:7687.
If you try to flash the keyboard with XONiX USB MCU ISP Tool at this moment, a request will be displayed:

The firmware ended with the following error:

Load File...
---------------------------------------
Bin File Check Sum : DB60
Open USB HID Device...
----VID: 0C45 PID: 7687----- No. 001
Command Responce :FW Version is not for this chip. Failed!!
----VID: 0C45 PID: 7687----- No. 002
Command Responce :FW Version is not for this chip. Failed!!
Total Time = 5.1 sec

[fightforlife]

There are different versions of this keyboard which use different MCUs. Most likely you got the newer one which is not yeet supported. Maybe check out this Discord, if someone knows more: https://discord.gg/MKE5dSN