Hello!
I’m trying to replace the flash drive with a Hex S
There are 2 reasons - for version 7.x 16 mb is not enough and I did not find an analogue of Hex S among the current devices (I need an SFP port and a POE output)
I’ve already done this successfully on the Hap AC2
But there were problems with the Hex S
I replaced the flash drive with 32 MB.
I was able to flash it through NetInstall older versions (6.18) formats a 32MB flash drive
If you install firmware from the 7 line (using NetInstall version 7 or placing the firmware version 7 in the root of the disk), the size of the flash drive is displayed as 16 MB.
Judging by the documentation for the processor, it cannot work with a flash drive larger than 16 MB.
But it works in version 6.18 
I also tried to put a flash drive of a larger size - 64 mb, but the device does not boot at all.
Perhaps someone changed the flash drive to the Hex S on another larger capacity?
Or, is there some way to format the remaining free area?