[intrax]

esjay wrote:

Both Android and Windows don’t read my SDCards anymore. They are detected but fail to mount.

I think its a uefi bios issue… I’m trying to find a solution, but there is NO support from Chuwi on this matter and lots of chinese tablets are suffering from this issue!

[intrax]

Windave wrote:

This may or may not be relevant to this tablet but it works with Teclast X80 Pro…. The SD Card problem is a bios setting which Win 10 requires and which for some reason unknown to anyone with reasonable intelligence, resets itself every time you switch to Android use! The bios setting you have to change is Advanced tab…..System Component….MS Custom Sdbus Driver….set this to ENABLED and the SD Card should work fine! Access the X80 Pro bios menu via “UEFI setting” in Win 10 Settings…..Recovery menu.

This is a clear sign of fxxxcked up uefi bios… in my hibook pro the sd card finally stopped working in android and windows. Would this be fixable in uefi bios ?

[intrax]

Hi,

Just wait a couple of weeks, it will stop working…

[intrax]

I managed to restore the GUID partition identifiers manually to their original values!

Problem solved.

[intrax]

Don’t worry, you did not knick anything off, rhe usb-c port just doesn’t provide usb 3.0 connectivity just 2.0

Can you share what you did to reprogram the bios chip?

thanks.

[intrax]

I’m looking for a way to reset the partition identifiers to their original values as this will recreate the original boot state.

Unlocking the bootloader as you suggest will wipe and reset the android partition, which is not what I want.

Thanks.

edit1: closer investigation shows the guid partition identifiers are unique. android uses TEE (trusted execution environment) and will not boot if these change. active@disk image does not restore the original guid partition id’s.

[intrax]

Another massive problem is the uefi bios, which is a hopeless mess! No legacy mode…

These tablets were not meant to be dual boot and the bios loads different firmware especially for the sd card device when switching the os.

It eventually breaks the sd card reader as the setting to load the ms custom sdbus driver gets lost during the switching. At least that’s whats happening uptil bios v231. Don’t know if the new bios (v234) fixes this), as I am weiry to flash the new bios cause many people bricked their tablets doing that!

 

[intrax]

Laura wrote:

because data in the RAM gets corrupted and written on disk, thus corrupting the filesystem

Exactly right !

[intrax]

hi,

It was running fine for a couple of days, but than corrupted the gpt disk. Bad idea!

[intrax]

Hi Andrew,

Have the same problem. SD-card (32Gb sdhc) was working fine for two weeks than suddenly was not recognized anymore in android and windows (dual boot machine). I reformatted the card on a pc (fat32) and the card seems fine as I can read and write files to it on a pc-cardreader without any problems.

Reading the chuwi forums I see a lot of weird problems involving sd-cards, so the chuwi sd-cardreader has some issues…

I think it’s time for Chuwi to address these problems !

If not I will be sending my tablet back to china for a refund…

cheers

[intrax]

Hi,

Have same problem on a hibook 10 pro. Came out of the blu, card was working fine for two weeks.

Did you find any solution as it is very weird !

[Author]

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