skr mini e3 v3 ratos 2.0 flashing issues

Trying to flash ratos 2.0 on the board. steps:

ratos config page
select mini e3 v3
compile fw
download firmware.bin
format 128mb sd to FAT
move firmware.bin to sd
plug into (powered) board
fast blinking status led
status led off for a second or so
slow blinking status LED

unplug SD
sd needs to be formatted to be read by windows
ratos does not recognise the board over usb

anyone got a clue? The board has nothing plugged into it except for power, usb and the jumpers for sensorless homing
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