Go to here:
surf to UbuntuTouch / Installer,
download and install the UBports Installer,
Read and follow the instructions.
edit: flash Volla OS first, then reboot and test if it works.
With UBports Installer you can also flash SFOS onto the Volla.
I have experience only with gs290.
There the ub installer would not say: its a volla.
So i did select the wanted phone.
I think it did reask if i am sure then run the installer.
When i needed to reflash, i had first to flash org image (volla os) then use ub installer
Yes @pawel.spoon , i forgot to mention this important step and edited my post above now.
@Seven.of.nine
So, UBports Installer shows the following: -
Error: fastboot: flash: Error: Flashing failed { āerrorā: {ācodeā:1}āstderrā:FAILED (remote:āNo support by lock controlā) fastboot: error: Command failed"}
The UT installer wonāt let me copy the error message, so the above may include minor spacing mistakes in my transcription, but you get the gist of it! At that point I closed the installer as no other options seemed good.
BTW the installer seems now to only offer UT and Volla OS, not SFOS - unless SFOS is only offered as an option after another OS is successfully flashed?
If you have followed all the usual steps to unlocking the phone (bootloader unlock and oem flashing setting in android), you can just boot the phone into fastboot mode and use @piggz flash script. @piggz, could you advise if there is some hitch with a GX4 PRO?
As for the UBports installer, recent versions do NOT support flashing SFOS. Sad, but true 
I have as a rule installed VollaOS first on these phones just to test that everything works and the android base is one that should be the same as the one @piggz develops the SFOS port with. So, my steps have been:
I have an unusual situation that Iām hoping someone here can help me with.
I live in Australia and bought a GX4 Pro online from Europe less than a year ago. Basically it has all the features I needed in a phone (dual sim, big removable battery, shock and water resistant) that no phone I can buy in Australia has.
Anyway, the phone has been great, and worked just fine until our government and the carriers got together to shut down 3G. Why would this affect a 4G phone I hear you ask? Well, the evil morons also created a blacklist of phones that would no longer work (ie, they actively cut off phones that are 100% fine and working). This includes just about every phone not bought in Australia. But this wasnāt a scheme to get people to buy more phones or anything, it was to help people. It will especially help tourists who arrive in our country only to find out their phone is useless and theyāll have to immediately purchase a new one.
Anyway, after much back and forth with my carrier it appears that my phone has been added to this blacklist and that itās actually a government mandate (I wish I was making this up). They use the IMEI number to identify oneās phone and completely block one from connecting to anything.
So my idea is to buy a cheap phone here in Australia and put the IMEI number from that onto my phone. After a little googling though it appears that changing that number on something running Android 12 is impossible. ie, one has to root the phone in order to do that.
So my question is, and Iām very sorry for the long preamble, is there a way I can āsimplyā change the IMEI number on my Gigaset GX4 Pro without changing the OS? I only need to do it once (well, twice actually, once for each sim) and after that I hopefully wonāt have to worry about it again. If I do have to change the OS, or make it dual boot, is that a major undertaking? Am I just an idiot with flawed thinking?
Any help with this would be greatly appreciated. Iām reasonably computer savvy but I have no experience working with rooted phones.
Hi @MrWhateverson ,
This doesnāt help you in the short term, nor does it answer your question about IMEi. I cannot help with that.
I did approach Volla about this at the end of October to see if they thought the 3g shutdown would be a problem. The reply was along the lines of āfrom technical point this (VoLTE and emergency calling over VoLTE) is no issue. But we got messages from users which are informed by their providers, that their Volla Phone is not supporting VoLTE. We do not know why they get this message. We are contacting the providers to solve this.ā
It could be worth trying to get Volla to continue to pursue the providers?
Good luck with the IMEI.
You might find it useful to watch this video that someone linked on the Volla forum.
Mobile Carrier IMEI Checks are a Consumer Abuse! How to Fight Back
In this video there is also reference to a tool with which you can program the IMEI.
Users in the USA seem to have similar problems.
Thank you very much for this, it is surprised me. I think I might be able to use (probably the latest version of) SN_Write_Tool to get the job done.
A couple of noob questions thoughā¦
Can anyone tell me which motherboard the GX4 Pro uses? I seriously canāt find that info anywhere.
Has anyone used this program before? Should I use it like they say in the tutorial (have the phone turned off and plug the cable in after I start the process)? Or should I start it in mode?
Iām currently stoked my chipset is from Mediatek. This seems like the best chance of success.
Thanks again.
Ok, I think it uses the MT6789 motherboard. Which sounds like a dodgy password
Can anyone confirm?
It is the MediaTek Helio G99 MT6789 so, yup
EDIT, Iāll add that I once, through bad impulse control, was forced to recover this (not the pro version, but same chip) phone from a zombie state. Gigaset, thankfully, didnāt lock it down as much as most manufacturers do. Thereās a good chance itāll work. Though Iāve NEVER tried this hack.
Alas, I have downloaded the latest version of SN Write Tool (version 2.1504) but the database (AP_DB_Base) links to an āoldā database list that appears to be last updated in March 2022 (Download AP BP DB DataBase to Write IMEI on MediaTek), and the MT6789 isnāt in the list. It does have the MT6785, but I feel that isnāt going to cut it 
Any other zany ideas?
unfortunately these files arenāt available anymore
Sailfish 5.0 Images for the X23 are here
nice, unfortunately i bricked mine on thursday
Im sure its fixable with either ubports installer or spflashtool
No, i cannot enter fastboot mode anymore. I was stupid and flashed android 12 without checks in fastboot. I have to let repair it by gigaset because itās a gx 4 pro actually
okay so unbricking seems to be free. i went to mobiletouch, the certified repair shop for gigaset in austria and they could flash it for free. i was lucky and got android 12. i was anxious and directly flashed sailfish os, which worked, but i cannot install any apps through the store, zypper or pkcon. i signed into my jolla account, but still nothing. i could install chum and apps without dependencies outside chum can be installed, but apps that need for example python3-dbus from jolla cannot be installed. normally i would then install with zypper, but that doesnāt work. also openrepos cannot be installed.
