Kindle Model No. DP75SDI

[cipi65]

Hi,

In first place, I want to ask what Kindle model is this ? I did't find DP75SDI in any list.
Inside looks like an PW2 but with SIM slot.
Problem is ( I think ) with the firmware because when I turn on, the backlight lit and kindle startup page blinks time to time.
I try to reset, holding the power button for more than 5 minutes. When I hold the power button for reset the LED blinks orange, 5 times.
I left to charge more than 24 hours, and I verify the battery voltage, and is ok.
I have usb to serial interface ( TIAO USB ) but I did't find any firmware for this model.

Any advice would be helpful.

[binaryhermit]

I believe that's a PW3.

[Dra_w]

It's kindle paperwhite 6th (2nd generation)

[katadelos]

Originally Posted by cipi65

In first place, I want to ask what Kindle model is this ? I did't find DP75SDI in any list.

It's somewhat confusing to judge by the model number on the back as both PW2 and PW3 models are DP75SDI, but the PCBID prefix corresponds with this boardid within the u-boot sources:

#define BOARD_ID_PINOT_2GB                  "02F"

This identifies it as a PW2 with 3G.

Originally Posted by cipi65

Problem is ( I think ) with the firmware because when I turn on, the backlight lit and kindle startup page blinks time to time.

The device sounds like it's bootlooping - IIRC U-Boot and Linux both have almost identical splash screens and the blinking probably indicates a transition between the 2.

Originally Posted by cipi65

I have usb to serial interface ( TIAO USB ) but I did't find any firmware for this model.

You can grab the firmware you need from here: https://www.amazon.com/update_Kindle_Paperwhite_6th_Gen.

I'm not sure if your usb-serial interface is suitable for this - if not, basic CH340, CP2102 and FT232RL based boards are available for relatively cheap on most online marketplaces.

As for actually fixing this, I'd reinstall the firmware from scratch. Assuming there's no issues with the eMMC storage, you should be able to enter the recovery menu by pressing [Enter] at the prompt after the kernel boots. You'll get a menu similar to this:

Menu
====
3. Load MMC over USB storage
E. Export FAT partition
U. Update using update*.bin file on FAT partition
D. dmesg / kernel printk ring buffer.
Q. quit

Export the FAT partition, load the firmware image to the Kindle then exit the menu and either select the Update using update*.bin file on FAT partition option or reboot the device. Both of these will begin installation of the update.

I'm curious about that switch on the RESET pad - was this fitted when you received the device and is it functional when you press it? I've never seen that pad populated before

[cipi65]

Many thanks for your answer.

I'm not sure if your usb-serial interface is suitable for this - if not, basic CH340, CP2102 and FT232RL based boards are available for relatively cheap on most online marketplaces.

My problem with the adapters is what model work, and is easier to configure for 1.8V.

I'm curious about that switch on the RESET pad - was this fitted when you received the device and is it functional when you press it? I've never seen that pad populated before [/QUOTE]

The RESET button is my work . I tried also to reset using this button.

[katadelos]

Originally Posted by cipi65

My problem with the adapters is what model work, and is easier to configure for 1.8V.

Any of the adapters using the chips I listed above will work - modern Kindles seem to be 3.3v tolerant if only RX+TX are connected (there's a bunch of reports of this in the serial jailbreak thread and I've also had a few 3.3v adapters permanently attached to my test devices for about a year now without any problems).

[cipi65]

As for actually fixing this, I'd reinstall the firmware from scratch. Assuming there's no issues with the eMMC storage, you should be able to enter the recovery menu by pressing [Enter] at the prompt after the kernel boots. You'll get a menu similar to this:

Menu
====
3. Load MMC over USB storage
E. Export FAT partition
U. Update using update*.bin file on FAT partition
D. dmesg / kernel printk ring buffer.
Q. quit

Export the FAT partition, load the firmware image to the Kindle then exit the menu and either select the Update using update*.bin file on FAT partition option or reboot the device. Both of these will begin installation of the update.

Finally I bought an USB interface, with FT232RL and I had time to the job.
The interface is with 3,3V and 5V jumper but I disconnect the jumper and I connect the supply pin from an external 1,8V power supply.
It was a little tricky because it was first time when I do this.
Using minicom, I put KINDLE in recovery, and after I transfer the bin file. First time, I got a message that it's not enough space, but I copy and after delete the books and everything was ok.

Many thanks for your help.