GNU Linux Debian (12) how to flash custom privacy enhancing ROM e-OS on Nexus 6P (Codename Angler) – how to fix ERROR 7 E1001 Failed to update system image and no sim detected error

23.Dec.2023

IT IS AN EXCELLENT ROM BUT IF THE USER NEEDS MAXIMUM PRIVACY GET SOMETHING GRAPHENE COMPATIBLE 😀

Nexus 6P?

Yes! it still got that 3.5mm Audio Jack 🙂 so full version mp3 player 🙂

also: it’s WLAN-WIFI reception is EXCELLENT (in comparison to Samsung S21 Ultra X-D (very shitty WIFI-WLAN reception))

yes, it’s an older phone, but that means: the user might be able to get it below 100 bucks
hardware and camera (12MP) wise imho it STILL packs a punch 😀
imho it was the best of two worlds: Google + Huawai (back in the days were those companies were not in an hostile spy and trade war with each other 🙁 it is a great example what mankind can acchieve when working together, but the working together is the hardest part)
a privacy enhancing Custom ROM /e/OS is a complete, fully “deGoogled”, mobile ecosystem
as seen on: https://www.androidcentral.com/eos-review-privacy-focused-android-without-google
- tested by: https://www.tcd.ie/news_events/articles/study-reveals-scale-of-data-sharing-from-android-mobile-phones/
- https://e.foundation/donate-2/
latest news
- https://e.foundation/feed
- https://mastodon.social/@e_mydata/with_replies
donate if possible: https://e.foundation/donate-2/

screenshot default android stock rom:

be aware!

problem: security patch level october 5 2021 https://www.wired.com/story/google-100-android-security-issues-critical-update/ ← will not fix a lot of security problemz 🙁

finally: no complaints more about “but there is no GooglePlayStore”

yes there is! It’s called “Aurora” Store and has a lot of Apps also games 😀 (for those kids that need it)

because the “original” GooglePlay Store comes (unfortunately) comes with privacy problem.

this is possible thanks to MicroG which e-OS has pre-installed 😀

but it has also to be said that loads of apps are missing from the original Google Play store
tux cart works excellent 😀

preparations:

keep a cool head, flashing a custom rom is nothing for the faint hearted X-D “NO MY DEVICE IS DESTROYED”
- at least if TWRP is already running, chances are good to get it working again
backup all important data that is still on the phone via known-to-be-good-usb-datacable via mtp (really like it, makes phone behave like usb stick :D)
get a good usb stick, format it ext4
get an USB A (USB Stick) to USB C (phone) adapter
- https://www.ebay.de/sch/i.html?_from=R40&_nkw=usb+a+to+usb+c+adapter&_sacat=0 for example https://www.ebay.de/itm/185215438075
charge phone up to 100%
insert sim card into nexus 6p
reboot it
does calling work?
does sms work?
- if it’s a new phone or new sim card should receive a setup-sms from provider that setups APN automatically)
does mobile internet (LTE) work?
(it might be required to manually put in APN -> please ask phone company about APN details)
on Stock ROM Android 8.0 this is done as following:
- confirm inet is working with default vendor stock rom

hostnamectl; # tested on
Operating System: Debian GNU/Linux 12 (bookworm)  
          Kernel: Linux 6.1.0-16-amd64
su - root
apt update
apt install adb fastboot

# it is not required but also possible to download the LATEST version of adb
wget https://dl.google.com/android/repository/platform-tools-latest-linux.zip
unzip platform-tools-latest-linux.zip

./adb --version
Android Debug Bridge version 1.0.41
Version 34.0.5-10900879

# get the right files for nexus 6p
https://doc.e.foundation/devices/angler/install

# get latest
https://dl.twrp.me/angler/
# using
twrp-3.7.0_9-0-angler.img (sha256sum: 21e41c0607b150f8dc5e5a4b0975a64d1eb62c4aff34920231d027e0793e8028)
# and
https://images.ecloud.global/dev/angler/
e-0.20-o-20211210151039-dev-angler.zip (sha256sum: a32742ff199112f8516f102a9611b45ba928e341c0d2f66dec1cc2edb4e1f0a4)

# copy both files on the ext4 formatted usb stick
# start the phone with stock-rom
# go into settings of android 8.0 default vendor rom
# find system settings -> software -> build number -> tap on it 7x times to enable developer mode
## in developer mode
### enable usb-debugging
### enable oem-unlock-flashing (there was no such option on nexus 6p android 8.0)

# attach device with known-to-be-good-usb-data-cable of high quality

adb devices
# look at phone's screen, it will show "trust this (bluetooth-mac)" check the box and say "yes"
List of devices attached
CVH7N15BXXXXXXXX device

# this should reboot the device
adb reboot bootloader

# and show this screen

# try
fastboot oem unlock
# FAILED (remote: 'unknown command') (it is already unlocked)
# it is already unlocked
fastboot flashing unlock
(bootloader) Device already unlocked!

# now the important part, go to folder where twrp-3.7.0_9-0-angler.img is
cd /to/where/this/file/was/downloaded/
fastboot flash recovery twrp-3.7.0_9-0-angler.img
Sending 'recovery' (18416 KB) OKAY [ 0.559s]
Writing 'recovery' OKAY [ 1.183s]
Finished. Total time: 1.792s

# if flashing of twrp went fine
# continue: via volume up / down select “recovery” mode (in red), hit power button to confirm selection
# after a reboot of the phone (WAIT!)

# the user should now be prompted with the "TWRP" Mount Decrypt Data "Enter Password" screen

# enter the pin that the user would normally enter during boot
# "swipe" to "allow modifications"
# now user sees the main twrp screen


# step1:) a new bootloader installed successfull! :D
# the user can do a little celebration dance right there! :D


# now step2) flashing the rom.zip
# now how to get the rom.zip on the device?

# here is where the official documentation fails
# and the usb stick to phone adapter is key :D
# sideload does not work :(
# also MTP upload seems to have a problem :(
# here COMES THE USB STICK SOLUTION :D
adb sideload e-0.20-o-20211210151039-dev-angler.zip
adb: sideload connection failed: no devices/emulators found
adb: trying pre-KitKat sideload method...
adb: pre-KitKat sideload connection failed: no devices/emulators found

# connect the USB Stick to the USB A Port of the adapter
# connect the USB C Port of the Adapter to the Phone



# then in twrp go to mount menu and check all boxes



# this is important to avoid this error
# this means not all partitions were mounted before flash


# continue: format partitions

return to TWRP return to main menu, then tap Wipe
Now tap Format Data and continue with the formatting process.Here a new screen may show where you will have to type Yes and confirm the action by clicking a button.
Caution: Format Data will remove encryption as well as delete all files stored on the internal storage. Remember to take a backup first. Check Requirements section above.
Return to the previous menu and tap Advanced Wipe.
Select the Cache and System and DalvikCache partitions to be wiped and then Swipe to Wipe

go back to TWRP main menu:

now the actual rom flashing 😀

in the TWRP main screen: tap on “Install“

select storage device “USB-OGT” (the ext4 formatted USB stick)

the user should see the zip file on the stick:

“e-0.20-o-20211210151039-dev-angler.zip”

click on it

now please sit still, don’t jump around, put the phone on a table, so nothing can disrupt the flash process

then swipe to flash it on the device 😀

flashed it 3x times for good luck

now

hit “Reboot System!” (bottom right button)

here is the complete song: https://soundcloud.com/xenox-afl/bitjam-podcast-120-one-step-forward-back

that the user now needs to dance to (COMPLETE SONG!) to celerbate the success! 😀

have phun with newly privacy enhanced phone 😀

same as last time: fix No Sim Card Detected:

This has been happening on many custom ROMs.
An easy fix is to go to security settings and change screen lock to swipe or none, then reboot.
That will remove the device protection that caused the no sim problem.
After the reboot, the problem is fixed and won’t happen anymore.
Then go back into security settings and change it back to whatever screen lock option you want.