When you flash the h7s from a usb you can’t flash it again using a usb. You can only flash it using a recovery image and that deletes all the slots. With the Pure2 image there is or was a facility where you can flash on the fly using an image either on the hdd or a usb BUT the image must be unzipped. You then get a choice of partitions to flash. It may be possible to even flash online using PURE2 but as the image is ancient that facility may be blocked/withdrawn.
There is a multiboot option and that should be checked in case there is an image on another slot.
Flashing online from the recovery image has me gobsmacked as you can only get an online image from an image, like vix image manager, and press yellow gives vix, openatv, opnpli,openbh and that’s it.
Box is 3 years old with internal hdd and epg stored on internal flash may mean it’s ……..ed. Removing the iptv plugins and reinstalling the latest or better still use bouquetmaker may solve the problem.