Slave cannot communicate with master after flashing this firmware!!

[Fais649]

Hey all, I have the Epomaker Split65, it comes with via support out the box, but until recently there was no qmk repo available for more advanced customization.
I was able to get it to compile and flash using this repo as a base instead of qmk base repo:
https://github.com/hangshengkeji/qmk_firmware/blob/tri-mode/keyboards/linker/wireless/module.h

But now the right half of the keyboard doesn't work...
When I unplug the master from the power, and then plug it back in, the leds on the right half turn on and stay on for like 20 seconds before turning off... If I enter bootloader mode on master while slave leds are still on, only the master leds switch off, indicating to me that the slave is not entering bootloader mode. connecting the slave directly to the pc does nothing, as it is not recognized at all.

I tried setting SPLIT_KEYBOARD = YES in rules.mk, but that had no effect

any advice would be really appreciated.

qmk console log

EPOMAKER:EPOMAKER Split65:1: SPLIT: receiving handshake failed
EPOMAKER:EPOMAKER Split65:1: Failed to execute slave_matrix
EPOMAKER:EPOMAKER Split65:1: Target disconnected, throttling connection attempts
EPOMAKER:EPOMAKER Split65:1: Slave sync failed1!
EPOMAKER:EPOMAKER Split65:1: SPLIT: receiving handshake failed
EPOMAKER:EPOMAKER Split65:1: Failed to execute slave_matrix
EPOMAKER:EPOMAKER Split65:1: Target disconnected, throttling connection attempts
EPOMAKER:EPOMAKER Split65:1: SPLIT: receiving handshake failed
EPOMAKER:EPOMAKER Split65:1: Failed to execute slave_matrix
EPOMAKER:EPOMAKER Split65:1: Target disconnected, throttling connection attempts
EPOMAKER:EPOMAKER Split65:1: SPLIT: receiving handshake failed
EPOMAKER:EPOMAKER Split65:1: Failed to execute slave_matrix
EPOMAKER:EPOMAKER Split65:1: Target disconnected, throttling connection attempts
EPOMAKER:EPOMAKER Split65:1: SPLIT: receiving handshake failed
EPOMAKER:EPOMAKER Split65:1: Failed to execute slave_matrix
EPOMAKER:EPOMAKER Split65:1: Target disconnected, throttling connection attempts
EPOMAKER:EPOMAKER Split65:1: Slave sync failed1!
EPOMAKER:EPOMAKER Split65:1: SPLIT: receiving handshake failed

[Epomaker]

Thank you for issuing. This is a Split keyboard. To make the right half work, you will need to flash the right half separately.

Here is how to get the right half into DFU mode: Remove the R_shift on the right half, and you can find a toggle switch. Switch it to the bottom, and then remove the R_Spacebar keycap and short-circuit the key by using a pair of tweezers attached to the holes where the two plastic feet of the switch are injected. Meanwhile, plug in the cable to the Type-C port of the right half, then the right half will go into DFU mode. Then, you can flash the right half with QMK Toolbox. After flashing, make sure the switch is toggled back to the top

Hope this can help you :)

[gwangyi]

Which pad should I short to make the right half in the DFU mode? It has 8 pads and I don't know which one I should do..

After flashing the firmware in the left half, it stopped turning into the DFU mode by pushing ESC key during connecting the usb cable. Is there any different way for DFU mode? I couldn't find the switch or pad from the back of pcb.