Here are the links to the test firmware:
M0129-3
M0129-6
After you update, you should see the following version after running voxl-esc-scan.py (except yours will be M0129-6). The firmware version will be 39.23 and this version will be reserved only for this test firmware:
INFO: ESC Information:
INFO: ---------------------
ID : 0
Board : version 40: ModalAi 4-in-1 ESC (M0129-3)
UID : 0x2039333557555304003F0029
Firmware : version 39.23, hash 30c088dc
Bootloader : version 184, hash 10bf24c8
...
In case you need help updating ESC firmware: https://docs.modalai.com/voxl-escs/faq/#q-how-do-i-update-esc-firmware
We won't officially release this firmware version in order to avoid the aforementioned risk of turning on 5.0V by just installing a firmware update, however we will work on enabling this in the ESC params.
Also, just as a reminder, please be careful soldering to the AUX test points, use high quality flexible cables, and use strain relief to avoid lifting the pads.
Alex