it might be faster to buy a replacement board or have the EMMC chip replaced by a professional .T.RT2861V09 board .
The HK.T.RT2861V09 mainboard is designed to support Ultra HD (4K) resolutions and smart features. Because it is a generic (OEM) chassis, multiple electronics brands use it under different model numbers. Common Brands and Models Using HK.T.RT2861V09: 40U600, 40U600GU, 49UP50, 55U600, 55U600GR, 55UR50GR SUPRA: STV-LC55ST1000U BBK: 65LEX-8139 ERISSON: 50ULX9000T2 HI: 65USY151X VEKTA: LD-50SU8719BS hk.t.rt2861v09 firmware
Note: These instructions are for educational purposes. Modifying firmware can void your warranty. it might be faster to buy a replacement
Corrupted firmware on the HK.T.RT2861V09 can lead to several performance failures: Common Brands and Models Using HK
dd if=/dev/mtd2 of=/tmp/art.bin bs=64k skip=15 count=1 (varies by build)
Used by professional repair technicians when the internal memory chip is completely corrupted or physically dead and needs replacement. These require hardware programmers like RT809H, UFPI, or UFI.