<s>
Bootloader	B-Application
unlocking	I-Application
is	O
the	O
process	O
of	O
disabling	O
the	O
bootloader	B-Application
security	O
that	O
makes	O
secure	O
boot	O
possible	O
.	O
</s>
<s>
On	O
smartphones	O
this	O
can	O
be	O
a	O
custom	B-Application
Android	I-Application
distribution	I-Application
or	O
another	O
mobile	O
operating	O
system	O
.	O
</s>
<s>
Some	O
bootloaders	B-Application
are	O
not	O
locked	O
at	O
all	O
,	O
others	O
can	O
be	O
unlocked	O
using	O
a	O
standard	O
command	O
,	O
others	O
need	O
assistance	O
from	O
the	O
manufacturer	O
.	O
</s>
<s>
Bootloader	B-Application
unlocking	I-Application
is	O
also	O
done	O
for	O
mobile	O
forensics	O
purposes	O
,	O
to	O
extract	O
digital	O
evidence	O
from	O
mobile	O
devices	O
,	O
using	O
tools	O
such	O
as	O
Cellebrite	O
UFED	O
.	O
</s>
<s>
Unlocking	O
the	O
bootloader	B-Application
usually	O
voids	O
any	O
warranties	O
and	O
may	O
make	O
the	O
device	O
susceptible	O
to	O
data	O
theft	O
.	O
</s>
<s>
On	O
Chromebooks	B-Operating_System
,	O
enabling	O
developer	O
mode	O
makes	O
the	O
system	O
less	O
secure	O
than	O
a	O
standard	O
laptop	O
running	O
Linux	O
.	O
</s>
<s>
Unlocking	O
the	O
bootloader	B-Application
may	O
lead	O
to	O
data	O
loss	O
on	O
Android	B-Application
and	O
ChromeOS	O
devices	O
,	O
as	O
some	O
data	O
is	O
impossible	O
to	O
back	O
up	O
without	O
root	O
permission	O
.	O
</s>
<s>
Sascha	O
Segan	O
from	O
PCMag	O
considered	O
a	O
locked	O
bootloader	B-Application
a	O
mistake	O
on	O
the	O
Qualcomm	O
Snapdragon	O
Insiders	O
phone	O
,	O
which	O
is	O
targeted	O
at	O
advanced	O
users	O
.	O
</s>
<s>
Unlocking	O
the	O
bootloader	B-Application
is	O
typically	O
done	O
during	O
the	O
process	O
to	O
obtain	O
root	O
access	O
.	O
</s>
<s>
The	O
bootloaders	B-Application
of	O
Nexus	O
and	O
Pixel	O
devices	O
can	O
be	O
unlocked	O
by	O
using	O
the	O
fastboot	B-Application
command	O
.	O
</s>
<s>
When	O
Motorola	O
released	O
a	O
bootloader	B-Application
unlocking	I-Application
tool	O
for	O
the	O
Droid	O
Razr	O
,	O
Verizon	O
removed	O
the	O
tool	O
from	O
their	O
models	O
.	O
</s>
<s>
In	O
2011	O
,	O
Sony	O
Ericsson	O
released	O
an	O
online	O
bootloader	B-Application
unlocking	I-Application
tool	O
.	O
</s>
<s>
For	O
the	O
Asus	O
Transformer	O
Prime	O
TF201	O
,	O
Asus	O
has	O
released	O
a	O
special	O
bootloader	B-Application
unlock	I-Application
tool	O
.	O
</s>
<s>
In	O
2012	O
,	O
Motorola	O
released	O
a	O
limited	O
tool	O
for	O
unlocking	O
bootloaders	B-Application
.	O
</s>
<s>
They	O
require	O
accepting	O
terms	O
and	O
conditions	O
and	O
creating	O
an	O
account	O
before	O
the	O
bootloader	B-Application
can	O
be	O
unlocked	O
for	O
a	O
Moto	O
G	O
.	O
</s>
<s>
Bootloaders	B-Application
can	O
be	O
unlocked	O
using	O
an	O
exploit	O
or	O
using	O
a	O
way	O
that	O
the	O
vendor	O
supplied	O
.	O
</s>
<s>
In	O
2018	O
,	O
a	O
developer	O
from	O
XDA	B-Application
Developers	I-Application
launched	O
a	O
service	O
which	O
allowed	O
users	O
to	O
unlock	O
the	O
bootloader	B-Application
of	O
some	O
Nokia	O
smartphone	O
models	O
.	O
</s>
<s>
Similarly	O
,	O
another	O
developer	O
from	O
XDA	B-Application
Developers	I-Application
launched	O
a	O
service	O
to	O
allow	O
users	O
to	O
unlock	O
the	O
bootloaders	B-Application
of	O
Samsung	B-Application
Galaxy	I-Application
S20	I-Application
and	O
Samsung	B-Application
Galaxy	I-Application
S21	I-Application
Phones	O
.	O
</s>
<s>
Huawei	O
announced	O
plans	O
to	O
allow	O
users	O
to	O
unlock	O
the	O
bootloader	B-Application
of	O
the	O
Mate	O
30	O
series	O
,	O
but	O
later	O
retracted	O
that	O
.	O
</s>
<s>
Huawei	O
has	O
stopped	O
providing	O
bootloader	B-Application
unlock	I-Application
codes	O
since	O
2018	O
.	O
</s>
<s>
A	O
bootloader	B-Application
exploit	O
named	O
checkm30	O
has	O
been	O
developed	O
for	O
HiSilicon	B-Architecture
based	O
Huawei	O
phones	O
.	O
</s>
<s>
When	O
the	O
bootloader	B-Application
of	O
the	O
Samsung	B-Application
Galaxy	I-Application
Z	I-Application
Fold	I-Application
3	I-Application
was	O
unlocked	O
,	O
the	O
camera	O
became	O
less	O
functional	O
.	O
</s>
<s>
This	O
could	O
be	O
restored	O
by	O
re-locking	O
the	O
bootloader	B-Application
.	O
</s>
<s>
For	O
the	O
Samsung	B-Application
Galaxy	I-Application
S22	I-Application
series	O
,	O
unlocking	O
the	O
bootloader	B-Application
has	O
no	O
effect	O
on	O
the	O
camera	O
.	O
</s>
<s>
The	O
WPInternals	O
tool	O
is	O
able	O
to	O
unlock	O
bootloaders	B-Application
of	O
all	O
Nokia	B-Device
Lumia	I-Device
phones	O
running	O
Windows	B-Protocol
Phone	I-Protocol
,	O
but	O
not	O
phones	O
like	O
the	O
Alcatel	B-Application
Idol	I-Application
4	I-Application
or	O
HP	B-Application
Elite	I-Application
x3	I-Application
.	O
</s>
<s>
The	O
slab	O
bootloader	B-Application
used	O
by	O
Windows	O
RT	O
could	O
be	O
unlocked	O
using	O
a	O
vulnerability	O
,	O
but	O
was	O
silently	O
patched	O
by	O
Microsoft	O
in	O
2016	O
.	O
</s>
<s>
The	O
bootloader	B-Application
on	O
M1	O
based	O
Macs	O
can	O
be	O
unlocked	O
.	O
</s>
<s>
The	O
equivalent	O
of	O
bootloader	B-Application
unlocking	I-Application
is	O
called	O
developer	O
mode	O
in	O
Chromebooks	B-Operating_System
.	O
</s>
<s>
Chromebooks	B-Operating_System
use	O
custom	O
bootloaders	B-Application
that	O
can	O
be	O
modified	O
or	O
overwritten	O
by	O
removing	O
a	O
Write-protect	O
screw	O
.	O
</s>
<s>
In	O
2013	O
,	O
the	O
bootloader	B-Application
of	O
the	O
Chromecast	B-Device
was	O
hacked	O
using	O
an	O
exploit	O
.	O
</s>
<s>
On	O
Android	B-Application
,	O
it	O
is	O
possible	O
to	O
relock	O
the	O
bootloader	B-Application
.	O
</s>
