Rupa X88 Pro 13 - RK3528 board with images

[Joao Cordeiro]

Actually, I was able to find that IC but in chinese version..

https://datasheet4u.com/datasheets/I-CORE/AiP1628/1571692

Looks like its some kind of low level chip that probably transforms low voltage signals into higher voltage, like the ones used on ethernet ports.
Probably to power up the LCD leds.

[shexplorer]

Hi there, I also bought one (V1.5) and tried to use armbian. Unfortunately, I managed to brick it. I booted your image @johlnx from sd, that worked. Then I overwrote the internal EMMC with your image and the box won't boot anymore. Any idea how I can fix it? I made an backup of the original image, but I also read that it may be incomplete because of read protection in uboot of the emmc? I also tried to get into MaskMode by pressing the button and connecting the USB 2.0 to my Windows-PC but no device is discovered. I attached the serial uboot log. Hope somebody has a suggestion how i can boot something again. Thanks

boot_with_armbian_sd_insert.log boot_without_sd_insert.log

[Joao Cordeiro]

@shexplorer
 

I did something similar to a tv box i had around, not this model.

 

Generally, the cpu comes with some sort of uboot. Written in firmware not mmc. The catch is that that uboot usually writes its persistent environment on the MMC. And most of the time its not even a file on a partition, like in (and this is an example) between bytes 2000 to 8000 of the mmc. This uboot is only visible via serial console. no hdmi output. (and its quite old)

 

This uboot then attempts to chainload the mmc or usb uboot. And its at this phase you get image.

So on my setup, i had CPU uboot but no environment (because i smashed it with my armbian image...), and that environment was needed to boot both mmc or usb.

 

Using a serial port (and pressing control +c ) i was able to instruct uboot it to boot armbian on the usb drive. And i mean manually with command like fatload 0x1000000 usb0.1 linux.img.

 

But every time i reloaded would go back to the endless loop.

So the next step was to find a stock image of my device and dump it into the mmc, via usb booted linux. (i actually only copied like the 1st 10MB, only needed uboot env, not the chinese android)

 

Please know that this is not the image you download from any manufacturer website, those are snap-in upgrades that only change part of the mmc, you need a image that someone extracted with dd command from the entire mmc.

 

 

After that i swore to never touch that mmc again...

Maybe this is your problem too
Get a serial connected to your device and check if you can see the cpu level uboot.

If it is the same issue, maybe someone here can give you the 1st 10MB of their device, if you create a new thread asking for it.

Edited 1 hour ago by Joao Cordeiro