SOLUTION: (I’m posting it as an answer because i can’t find an option for editing my original question 
). With help of a colleague who found this post https://discuss.cubepilot.org/t/how-to-activate-dfu-mode-on-cube-orange/12704/5 we manage to find that the Here4 comes with a ST-LINK(JTAG/SWD) port and pads, located on the upper left side on the bottom part of the board. We then connected it to a ST-LINK v2 and using STM32Programmer we flashed the firmware and bootloader from https://github.com/CubePilot/GNSSPeriph-release/releases/tag/v1.14.4, did a power cycle and the device regained functionality.