If it can help someone I have uploaded the english version of the firmware (Dragon Miner 4 blades) on Mega:
https://mega.co.nz/#!0VdjTLbb!ZMIgygrA0j7dbOoJdNI9Akhn2x6oVGAJLRTfOy8sh_8
Any updated English versions for the original 5 blade units? Thanks in advance if one exists.