Did some digging on renaming the update_data_hw_eu.app but all i could find was not Mediatek related, but rather HiSilicon or Qualcomm.
Just to make sure even tried out renaming update_data_hw_eu.app and place it under the 2 new locations on the SDCard, like this:
but without any success
DC Phoenix is what I used to flash twrp past a locked bootloader. If hcu client will do repairs you can get fastboot working and dc phoenix will flash whatever you feed it, literally whatever so can be very dangerous. I was fine with it because I know my twrp works on the device no problem. Anything else would be a total gamble. What it does is circumvents device checks and fastboot checks, so fastboot doesn't care what you feed it, it will send and write it. The device doesn't get to say no because they've gotten around the checks it does. That's my explaination not theirs on what it does in a nutshell. It does more but that you can read if you want. To start off go to dc-unlocker to get hcu & dc phoenix and buy credits or license from them as some resellers try to increase the price. Had one telling me $40 for a $20 license and blaming it on exchange rates. Bought from dc-unlocker and exchange rate put it at $21.73 a far cry from the 40 that other cat was trying to rob me of.