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How to enter FEL on PB618, backup, restore emmc?

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I would like to enter FEL mode on Pocketbook 618 but I do not know how. I tried this mutiple times and pressing different buttons but it didn't work, device booted normally.

I am learing about Linux, programming and I would like to use normal GNU/Linux distro on PB618 such as PostmarketOS, Debian and etc. To start experimenting and learn I need to somehow enter FEL mode. Also I want to backup emmc and restore it if I mess with it and device would not boot into OS, I do not know how to do it.

Here is what I tried to enter FEL:
  • Turn off while connected to pc, hold button and press power button
  • same but hold power button for 2 sec and then quickly click it >3 times
  • flash sunxi fel image to external SD card and place it in PB618(I did it from termux and SD card is 128GB, Pocketbook can see it using fdisk -l but cannot mount and does not see in library even with normal fat32 with normal files and no fel image)

Do you know how to enter FEL mode? I can disassemble it if needed.

I added this to soc_info.c in sunxi tools:
Spoiler:
Code:

},{
                .soc_id      = 0x1699, /* Allwinner B288 */
                .name        = "B288",
                .scratch_addr = 0x1000,
                .thunk_addr  = 0xA200, .thunk_size = 0x200,
                .swap_buffers = a10_a13_a20_sram_swap_buffers,
                .sid_base    = 0x01C14000,



My PB618 is jailbroken thanks to pbjb.

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