This is how to recover your Q5/Q10 Pro if it hangs on HIMEDIA logo after an attempt to upgrade from Android 5.1 to Android 7.
Following these instructions will invalidate your warranty, so if you bought your Q5/Q10 Pro from us we'd prefer you to send it back to us to be fixed. This guide is more for people who bought from other sellers with less honest warranty policies.
THIS PROCESS IS RISKY! DO NOT ATTEMPT IF YOU'RE NOT COMFORTABLE WITH THE INSTRUCTIONS!YOU WILL NEED A SMALL PHILLIPS HEAD SCREWDRIVER, A LARGE FLAT HEAD SCREWDRIVER / TWEEZERS, AND PLIERS / SMALL ADJUSTABLE SPANNERPrepare recovery USB pen driveYou'll need a USB pen drive formatted as FAT32.
For both Q5 Pro and Q10 Pro download these files and extract the archive to the pen drive: http://www.mediafire.com/file/zijqx1mjf04d1xx/Q5_%2B_10_Pro_Recovery_Boot_Files.zip
You should now have a pen drive containing bootargs.bin, fastboot.bin, recovery.img.
download the Android 5.1 to Android 7 migration firmware for your device and extract the update.zip to the pen drive.
Q5 Pro: http://www.mediafire.com/file/ylwc9cbk6bzly14/Q5_PRO_ANDROID_5.1_TO_ANDROID_7_MIGRATION_FIRMWARE.zip
Q10 Pro: http://www.mediafire.com/file/r55t37rs732033s/Q10_PRO_ANDROID_5.1_TO_ANDROID_7_MIGRATION_FIRMWARE.zip
You should now have a USB pen drive with bootargs.bin, fastboot.bin, recovery.img, update.zip files.
The next stage is the tricky bit, you need to boot the box whilst shorting 2 pins on the PCB. This is easier for Q5 Pro than Q10 Pro.
Q5 ProRemove the white feet from the base. Remove the four screws underneath. The base will fall away.
Insert the USB pen drive. Locate the two pins on the PCB indicated on this image:

https://www.mediafire.com/view/v6kgv529t2ad20m/q5propcbrecpins.jpg/file
Using a wide screwdriver or tweezers short the two pins indicated (bridge them) and hold them shorted whilst providing power to the Q5 Pro (or pressing the power button if it's in standby).
You should get a brief flash of the HIMEDIA logo and then the Android update droid screen and a progress bar.
The box will reboot into Android 7 2.0 migration firmware. Now install latest Android 7 firmware using Android 7 to Android 7 update file. See here: http://www.futeko.com/newforum/index.php?topic=711.0
Put the Q5 Pro back together, the reverse of taking it apart!
Q10 ProQ10 Pro is more difficult because it requires near complete disassembly to get access the the PCB pins.
First open the HDD lid as normal. Remove the 4 plastic plugs in the top. Unscrew the screws underneath, they are phillips head type. You can leave them loose in the plastic casing. Remove the two screws holding down the SATA connector. Now gently pull up the plastic HDD casing, being sure that the SATA connector does not catch.
Once you have the plastic HDD casing removed you can unplug the SATA connector from the PCB (two cables - power and SATA), unplug the fan (one pull connector), and the front LCD (two pull connectors).
The wifi connector will also need to be removed to enable complete removal of the PCB. Using pliers or an adjustable spanner remove the nut from the outside. It will now be possible to pull the wifi antenna connector into the Q10 Pro casing.
Remove the four screws fixing the Q10 Pro PCB to the base of the casing. These are at the four corners and are the only accessible screws.
You can now lift the PCB completely away from the casing. It requires a little gentle wriggling to manipulate it around the ports on side and back.
Once you have the PCB flip it around and lay it on the Q10 Pro casing like in this picture:

https://www.mediafire.com/view/9ddat7gamti2q0p/q10propcbrecpins.jpg/file
Reattach the two LCD cables and insert the previously prepared USB pen drive.
Using a wide screwdriver or tweezers short the two pins indicated (bridge them) and hold them shorted whilst providing power to the Q10 Pro (or pressing the power button if it's in standby).
You should get a brief flash of the HIMEDIA logo and then the Android update droid screen and a progress bar.
The box will reboot into Android 7 2.0 migration firmware. Now install latest Android 7 firmware using Android 7 to Android 7 update file. See here: http://www.futeko.com/newforum/index.php?topic=711.0
Put the Q10 Pro back together, the reverse of taking it apart!