eMMC/SD Access,
Select Boot Partition 1
Open preloader,
Set Start address 0x0000 0000 0000
Set Data lenght select "File Size" from drop down menu (first option)
Click "Write eMMC".
After this, tablet must enumerate as MTK usb, and then You can use factory recovery firmware flasher and flash it.
There is also NVM file for it.
eMMC Plugin cannot work with factory scatter files and without bmtpool partition for now.
If You manage to repair it, read full dump after process is finished.
[Attachment: preloader_htt77_tb_jb.rar]
[Attachment: (NVM)Prestigio PMP5785C3G_Quad_MT6583_eMMC_.rar]
[Attachment: PMP7280C3G.20130321.V2.0.0.0.rar]
[Attachment: filesize.jpg]