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Repair you box by optiflasher see here how to use it ..
1-Use " 3-Fix Bad Sector "Sectors Recovery"
2-Select Repair [No Ca Found] and choose bootloader for your sim (DM800-Sim2.01-ssl84b)
After that flash again any image for your sim by using "Flashing by Network lan only"
And don't update you image online This option only for Genuine box not for Clone ...
1-Use " 3-Fix Bad Sector "Sectors Recovery"
2-Select Repair [No Ca Found] and choose bootloader for your sim (DM800-Sim2.01-ssl84b)
After that flash again any image for your sim by using "Flashing by Network lan only"
And don't update you image online This option only for Genuine box not for Clone ...