Megafon-S4 and Avvio-T519 models supported, Chinese models i

[Support]

.Megafon-S4 model supported (flash read/write, sp-unlock, user code, repair, emptyboard flashing)
.Avvio-T519 model supported (flash read/write, sp-unlock, user code, repair, emptyboard flashing)
.MT6252 flash read/write for test
.boot files updated
.new NOR flash types supported
.new NAND flash types supported
.security area repair improved (18 new firmwares supported)
.firmware database updated