[HELP] MTK MT6582m how i get 29Gb memory? - Android Q&A, Help & Troubleshooting

Hello.
I have one old Lenovo with MT6582M , which has 1gb ram and 4rom, which i flashed with stock rom using SP flash tools. After that phone was in bootloop, then tried to reflash but got error with checksum that recovery image isn't same size. And then i realize there is no recovery mode.
Next i format all data, and flash again, all went OK. But phone won't power on anymore, no charging, nothing...
PC recognizes it as 3 different ports, it depends on how i connect it (with ,without battery or vol key pressed) : Mediatek preloader USB VCOM (Android) , ADrom port , and MediaTek USB port
I tried 3 STOCK roms from different sites, flashing process has no issues, but phone still can't turn ON. But if i check DA DL all with chksum, after flash i get this error:
Brom error: chksum_error (1041)
Tried to flash only boot, after that whole rom again, tried to firmware upgrade but got Error: Failed to get PMT info.
I tried many versions of SP flashtool, and the older ones show me this 29Gb+8gb in statusbar, which i can't say how happened, but it seems PMT-partition memory table , has some problems.
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Does someone has any ideas for me ?