Yes it needs to be plugged in, it's a hardware way of getting to bootloader mode. The button on the M10-b or a Teensy just connects those pins in an easier and safer way.
Connecting 5v to ground could kill the chip so don't slip if you're planning to tweeze pin 13 to 15.
Good luck!
Great news, I opened the case and there was a yellow button on the back and RAMA support said it was a reset, so that works. It's now stuck on being a ATm32U4DFU device even after flashing.
*** Attempting to flash, please don't remove device
>>> dfu-programmer.exe atmega32u4 erase --force
Erasing flash... Success
Checking memory from 0x0 to 0x6FFF... Empty.
>>> dfu-programmer.exe atmega32u4 flash "D:\Chrome Downloads\wilba_tech_rama_works_koyu_default_845aeee0.hex"
Checking memory from 0x0 to 0x55FF... Empty.
>>> dfu-programmer.exe atmega32u4 reset
0% 100% Programming 0x5600 bytes...
[>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>] Success
0% 100% Reading 0x7000 bytes...
[>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>] Success
Validating... Success
0x5600 bytes written into 0x7000 bytes memory (76.79%).
*** DFU device disconnected: Atmel Corp. ATm32U4DFU (03EB:2FF4:0000)
But still shows up as ATm32U4DFU in device manager. Still a step forward lol.