[Replicant] Trying to reflash Samsung Galazy Tab A6, but encountered "FRP lock".

[Denis 'GNUtoo' Carikli]

On Sun, 11 Jul 2021 21:36:08 -0400
"A. F. Cano" <afc54 at comcast.net> wrote:

> Hi,
Hi,

> At some point, I don't recall where, this device (Samsung Galaxy Tab
> A6) was identified at i9100, but now that I've done a factory reset
> lsusb only says:
> 
> Samsung Electronics Co., Ltd Galaxy series, misc. (MTP mode)
How did you manage to identify it as "i9100" ? Sometimes things like
lsusb and so on misidentify devices. It could be interesting as we
might need to update our installation manual if there are some
misleading clues somewhere.

While we do support the GT-I9100 variant of the Galaxy SII, we don't
support any Galaxy Tab A6 yet nor any Galaxy Tab A and as far as I know,
no one tried to add support for any of the Galaxy Tab A in Replicant.

In most cases, installing a Replicant release for one device on another
can be dangerous and won't work.

There are some exceptions though: when the devices are really close it
sometimes work (though I don't know if it's dangerous or not).

For instance, I've managed to use the Galaxy Tab 2 WiFi (GT-P3110)
images on the Galaxy Tab 2 GSM (GT-P3100). There also might be some
devices that have 0 hardware differences but have different variant
code names for one reason or another.

But here the Galaxy Tab A6 seems to have an Exynos 7870[1] or other
processors/system-on-a-chip from similar generations so it looks very
different. 

The Galaxy SII (GT-I9100) has been released in 2011, and I bet that the
Galaxy Tab A6 is much more recent, so it's unlikely to contain the same
chips.

> I've managed to put it into Download mode, retrieved the pit file and
> attempted to reflash the RECOVERY partition and the BOOT partition
> with heimdall but it fails with this message on the device:
> 
> "Custom binary blocked by FRP lock"
I don't know anything about FRP lock. Maybe LineageOS, xda-developers
or postmarketOS have information on it. I would be interested to learn
about it too, so if anybody has good links on it it would be great.

> I've searched and found various ways that supposedly allow this block
> to be removed, but none work.  
> 
> The recovery.img (twrp) is supposedly for this exact device, the
> boot.img allows for rooting it, but I can install neither.
> 
> This page:
> 
> https://www.droidviews.com/root-samsung-galaxy-tab-a-sm-t280-and-install-twrp/
> 
> has the instructions I followed and the images I downloaded.
> 
> Is there a way to bypass this "FRP lock"? There appears to be no way
> to do anything on this device without a google account, or without an
> internet connection.
What is the exact variant code name of your device? SM-T280? 

Is SM-T280 a variant of the Galaxy Tab A6?

References:
-----------
[1]https://www.notebookcheck.net/Samsung-Galaxy-Tab-A6-10-1-SM-T580.183633.0.html

Denis.
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