adeadtrousers / android_device_unihertz_atom_lxl

Common device tree for the Unihertz Atom L and XL

Common device configuration for the Unihertz Atom L and XL

This common device tree is intended for the usage in a LineageOS or similar building environment.

If you are looking for a special device tree for the usage in a TWRP or similar environment head over to https://github.com/ADeadTrousers/twrp_device_Unihertz_Atom_LXL.

The Unihertz Atom L (codenamed simply "Atom_L") and the Atom XL (codenamed simply "Atom_XL") are two rugged small smartphones from Unihertz, released in July 2020. They are both almost identical except the Atom XL offers an integrated digital mobile radio (DMR).

Dependencies

Additionally to this common device tree, you'll need one or both model device trees

• Atom L (model)
• Atom XL (model)

and one or all of the four regional device trees

• Atom L Region EEA (european union)
• Atom XL Region EEA (european union)
• Atom L Region TEE (non-european union)
• Atom XL Region TEE (non-european union)

Releases

For the actual releases head on over to the device tree of the individual devices:

• Atom L Region EEA (european union)
• Atom XL Region EEA (european union)
• Atom L Region TEE (non-european union)
• Atom XL Region TEE (non-european union)

Documentations

• HOW-TO-BUILD.md - Building instructions for LineageOS 18.1.
• HOW-TO-INSTALL.md - Installation instructions for the Atom L/XL.
• HOW-TO-UPDATE.md - Update instructions for the Atom L/XL.
• HOW-TO-UPGRADE.md - Upgrade instructions for the vendor portion of the Atom L/XL.
• HOW-TO-EXTRACT_FILES.md - Instructions to extract files directly from the Atom L/XL stock rom files.
• HOW-TO-EXTRACT_SEPOLICY.md - A little guide to extract sepolicy rules from stock or phone.
• HOW-TO-FLASH-STOCK.md - Instructions on how to use the SP Flash Tool for MTK based devices.
• HOW-TO-FLASH-SUPER.md - Instructions on how to modify super.img and flashing it onto the device.

Special Thanks To

• PeterCxy from the XDA forum for helping me and providing the device tree for Atom L.
• The device tree for the Atom L which was a great step-by-step guide on how to setup my own device tree.

android_device_unihertz_atom_lxl's Issues

Include Toolbox

Stock ROM comes with an app called Toolbox which includes various handy tools like a compass, a bubble level and so on.
It is a little bit blotched though for my taste and you are not able to hand pick the tools you want. I tried to and the phone started to bootloop.
So for now this will be a "wontfix" for now and this issue is for describing the cause.
That doesn't mean nobody else could try it. Anyone could fork this device tree and try get this to work.
The apks some would need are mainly on the product partition of the stock ROM and start with the name "Agui". Though I'm not sure that every single one of them is really needed and part of Toolbox.

DMR does not transmit or recieve audio when usb audio routing is active.

DMR app opens and is stable. Messaging works. When trying to speak on intercom, it looks like it is trying to transmit; mic button glows red when pressing and speaking. It also looks like it attempts to receive incoming audio; mic button will glow green when it detects that there is audio being transmitted on that channel.

Tested with:

• Phone A - Atom XL - Factory Stock
• Phone B - Atom XL - Lineage OS 18.1

Include IR-Remote

Stock ROM includes a handy little app to use as an universal infrared remote. At first I planned to include it but now I'm not so sure anymore:

• Since the last update there are far more additional libraries needed.
• Most of these hint a connection with alibaba/baidu (chineese google).
• I read some reviews that it comes with a default set of devices and is not able to "learn" new instructions.

So that's enough for me not to include it. This issus is therfore a "wontfix" for now and serves as a explanation.
Maybe some time later when I have the time I'll search for a working (open source!) alternative to include instead.

Include an option to switch back and menu key (left and right function keys)

In stock ROM there was an option to switch the two function keys.
It's missing in LOS.
NavButtonRemap (https://github.com/shuhaowu/NavButtonRemap) should do the trick. So I'll try to include it in my builds somehow.
Or I'd need to find another solution.

Include FM radio

The FM radio app and everything needed for it seems to be on product.
But before I include it I want to make sure that there is not other option.
Best would be to have an "open source" alternative.

LiveDisplay is not working

I just got word that LiveDisplay isn't working at all.
The settings are there but it cannot be activated.

Notification LED not working

The notification LED does not work.
I found various settings (product build.prop, ueventd,rc) mentioning the three led colours and have already copied them but it's still not working. So anyone who knows how to get it to work is much appreciated.

Bluetooth audio channel isn't working

Since the switch to 18.1 a headset (or a car radio) can be connected to phone but while the app (e.g. vlc) can be controlled from the external device the sound is coming from phones speakers.

Mobil data is not working on Verizon (maybe not the only carrier)

The user it_unihertz_when_i_pee on xda made me aware that the data connection doesn't work for certain carriers. In his case it was Appalachian Wireless which is a subsidiary of Verizon.
https://forum.xda-developers.com/t/rom-10-0-unofficial-lineageos-17-1-for-unihertz-atom-l-and-xl-alpha-2022-01-31.4171407/post-86353079

The thing is that LOS reports the network as mcc=311 / mnc=480
https://forum.xda-developers.com/t/rom-10-0-unofficial-lineageos-17-1-for-unihertz-atom-l-and-xl-alpha-2022-01-31.4171407/post-86363279

While the stock rom reports it as mcc=310 / mnc=756
https://forum.xda-developers.com/t/rom-10-0-unofficial-lineageos-17-1-for-unihertz-atom-l-and-xl-alpha-2022-01-31.4171407/post-86389579
Which isn't even a valid combination according to https://www.mcc-mnc.com/

Therefore my best guess is that stock rom uses a different technique to determine the network settings. Maybe it's this
https://source.android.com/devices/tech/config/carrier

So maybe it's that ominous ims service that PeterCxy tried to get to work in his build for VoLTE
https://forum.xda-developers.com/t/rom-unofficial-lineageos-17-1-for-unihertz-atom-l-20200828.4139423/post-83157909

My problem here is I neither have problems with my carrier which works just fine with apns-conf.xml nor do I have a contract which includes VoLTE or anything "fancy". So I'm rather limited in testing / debugging for a solution. Currently all I can do would be blindly guessing what is missing or needs a change, do a build, send it half way around the globe to get it tested only to find out it still isn't working.

So every help is appreciated.

Too small "main" partition prevents resizing during flashing

When trying to install after disabling AVB and doing a full wipe, I get this error:

Audio jack does not work

Connecting headphones to audio jack you can hear the slight clicking noise they make on contact but nothing else happens.
In stock ROM you could see an icon in the status bar but not in Lineage.

The options for USB tethering and WiFi hotspot are missing

I suspet a missing configuration in the build-files.
Will need to look more into possible settings.

Include more APNs

Some smaller carriers are neither on apns-conf.xml provided by unihertz nor the one provided by LOS.
With the parameter CUSTOM_APNS_FILE it should be possible to provide additional informations.
The underlying script is not able to correctly pass a xml file so a workaround is needed.

Rear Camera not using right resolution

The Unihertz website advertises a rear camera resolution of 48 MP but the Lineage Camera app only reports 11.8 MP.