Leo is manufactured with 2 different NAND-Flash ROM chipset types. You can detect the type entering tri-color boot mode.
If you see
PB81120 SS-B3 in the first line - that means NAND-Flash ROM from Samsung - KBY00U00VM
If you have
PB1120 HX-B3 in the first line - that means NAND-Flash ROM from Hynix - h8BFS0WU0MCR
After one year usage Samsung chipset usually has a dozen of bad clusters. Hynix normally has none of them or just a couple.
So for devices with SS-B3 and Samsung chipset recommended flashing algorithm is the following:
For devices with HX-B(3/С) and Hynix chipset - Task28 is totally acceptable.
The chipset information is provided by haccker
Awesome post from minhduong11 on other thread.. fortunately i have hynix chipset but i dont know how to do task28 ..can somebody shed some light on this 2 tasks or difference between them .