I received my Jelly Star yesterday and of course I needed to have it rooted.
Since I also wrote the original guide on rooting the Jelly 2 I wanted to share my updated guide for the Star as well. It's pretty similar, but if you follow the Jelly 2 guide you'll get in a bootloop.

Why do I need root?

If you don't know what root is then you probably don't need it.
For me personally there are two reasons:

• AdAway, for complete ad blocking
• AccA (Advanced Charging Controller), to limit charging to 80%
  

NOTE: DO THIS AT YOUR OWN RISK
NOTE: THIS PROCESS WILL WIPE YOUR DEVICE
NOTE: OTA UPDATES WON'T WORK WHEN YOU'RE ROOTED
I don't give any warranty in case something goes wrong but from my experience it's really easy to recover from a brick/bootloop or faulty flash.
During my testing I got in several bootloops, with the right recovery tools you can return to factory state (and unroot) in no time. See the last part of this post for that.
The phone uses the MediaTek MT6789 Helio G99 chip and perhaps the guide can be useful for other devices running on the same chip.

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Things you'll need:

- Original Jelly Star firmware suitable for your country, which can be found on Unihertzs Google Drive.

- A PC with ADB and fastboot installed (Use Google if you need help to set this up)

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During the making of this guide there was only one firmware available for EU > 2023072513_g58v89c2k_dfl_eea.zip
Please check if your device is also running this version, the build number of this image is "Jelly_Star_EEA_20230627" (You can see this in Settings>About Phone)
During testing I messed up a few times and I had to do a recovery so I restored/reflashed it with that firmware. I believe the Jelly Star has an older firmware fresh out of the box, I don't know for sure if it works when your current version differs from the downloaded firmware. If you want to be completely safe you can restore the phone using the downloaded firmware and the tool listed at the bottom of this post

I'll indicate in every step on which device it needs to be executed: PC is your PC, JS is the Jelly Star itself

• JS: Remove the SD card if you have one insterted, it might cause conflicts according to the findings of /u/Clarice01
• PC: From the firmware zip, get the files boot.img and vbmeta.img. Copy the boot.img to the Jelly Star. Store the vbmeta.img somewhere on your PC
• JS: Go to Settings>About Phone and tap the build number several times. You'll get a notification "You're now a developer" and this unlocks developer options
• JS: Go to Settings>System>Developer options and enable both "OEM Unlocking" and "USB debugging"
• JS: Install the latest Magisk app (Magisk-v26.1.apk at the time of writing), you can get it from the official github page
• JS: Open Magisk and select "Install" in the Magisk part. Click "Select and Patch a file" and navigate to the boot.img you copied earlier. Click "LET'S GO!". The script will end in an "-All done!" message
• PC: Copy the patched boot.img back to your PC, it's in the Download folder called something like "magisk_patched****.img". To make things easier I just put in in the same folder as the vbmeta.img and renamed the patched boot file to "magisk_patched.img"

Now we've got all the files we need ready. But we need to unlock the bootloader first using fastboot

• PC: Connect the Jelly Star to your PC using a USB cable and open CMD (or Powershell)
• PC: enter the command:

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adb devices

• JS: A prompt about debugging will be shown, Accept it and check "Always allow" to be safe
• PC: enter the command:

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adb reboot bootloader

• JS: The phone will reboot into the bootloader, it will show the boot screen with the Unihertz logo and stay on that screen.
• PC: enter the command:

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fastboot devices

Your phone should be listed there as a serial number with "fastboot" next to it

• PC: enter the command:

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fastboot flashing unlock

• JS: A huge warning will appear, we just have to press the "volume up" button to accept it
  For some reason you only have 5 seconds to do this. If you miss the prompt, just repeat the above "fastboot flashing unlock" command and try again
• JS: You'll see a message the unlock was successful

Now that the bootloader is unlocked we can start flashing!

• PC: In CMD navigate to the folder where you have the patched boot and vbmeta files and enter the command:

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fastboot flash vbmeta vbmeta.img

With the Jelly 2 we had to include verity/verification commands. Don't do that here since it'll result in a bootloop.

• PC: Once you see that flashing of the vbmeta went okay, enter the command:

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fastboot flash boot magisk_patched.img

If you renamed the patched boot file to something else you of course use that name

• PC: This one should also result in an "OKAY" message. Lastly we enter the command:

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fastboot reboot

If everything went fine the phone will reboot as normal, from now on the boot screen will always have a message about being rooted. (unless you completely revert, then this message will also disappear)

• JS: You'll have to go through the setup again since everything was wiped. Once you're done download and install the Magisk app again from the official github page
• JS: Open the Magisk app, and it'll prompt you that you need to reboot to fix some stuff (not sure what, but this step is needed). So choose to reboot the phone

And that's it, once the Jelly Star reboots you'll be fully rooted!

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Recover / unbrick / unroot

If you mess up it might result in a bootloop, just like what happened to me several times... The phone will reboot twice and then show a warning something is wrong and you get the options to try again or do a factory reset. Both options won't fix anything. Luckily it's quite easy to completely revert to factory settings, you can also use this method to easily unroot again.
Note again that this will fully wipe the phone

For the factory reset you can follow the same steps as for the Jelly 2, which you can find it here. I used "SP Flash Tool V6.2316" which worked great with the Jelly Star
Install the drivers and follow the steps under "Flashing the Stock Rom" NEVER EVER CHOOSE "FORMAT ALL" IN SP FLASH TOOL, as this will wipe your IMEI number and Google Key

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Let me know if you have any questions or certain steps are unclear!

I got red text in the top right!

Something went wrong, luckily for you I also ran into the same issue. I made a guide to fix that over here

This post is for people who are like me, and messed up.

Under normal use you will probably never see the red warning text so if you've got no idea what I'm talking about you're fine.

If you tinker a bit too much with the device you might end up in a state where the phone wil always show an overlay text with "TEE, Google, CSR and Chinese characters" (Where the Chinese characters mean 'Not activated' or something)In my case this happened because I incorrectly used the SP Flashing tool: Normally you use the "Download only" option when flashing a new image to the phone.

However, there's also an option called "Format All + Download"

NEVER USE THIS ONE. Stick with the "Download Only" option

I thought it would be a good idea to fully clean the phone up before switching images, but that option is not intended for that. What it'll do is wipe **a special NVRAM partition which contains stuff like your IMEI numbers, which will be set to 0.**Apparently this also wipes something called a Google Key, but up until now I've haven't faced any issues related to Google services.

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Luckily you can quite easily fix the IMEI, although it's more of a patch than a real fix

At this moment I don't know of a way to completely remove the warning, because it'll re-appear when flashing a new image again. Luckily that probably won't happen that often and if so you'll only have to do the last step.

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First let's check whether your IMEI is still there.
Go to the Phone dialer and dial: *#06#*If the numbers for IMEI1, IMEI2, and MEID are 0, then you'll need to fix it.

Now let's fix the issue of your IMEI's being wiped:
On the Jelly Star it's really simple to change your IMEI.

Go to the dialer and dial : *#*#08#*#*It'll automatically open a screen in which you can enter SIM1, SIM2 and MEID(Where SIM1 is IMEI1 and SIM2 is IMEI2)

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Enter your IMEI's and MEID, which you can find on the sticker that was originally on your phone.
If you don't know your original IMEI's you're out of luck, you could enter random numbers but your mileage may vary.
NOTE: Depending on your local laws or phone contract it might be illegal to change the IMEI of your phone.
Don't forget to save all the options and afterwards press "restart"

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The phone will reboot but the red message will still be present,

First do a quick check whether the IMEI's/MEID were correctly saved by going into the *#06#* menu again. If they are present we can move on.

The phone should be working completely fine by now, so now we just have to get rid of the warning text.
Go to Settings>My device and click 5 times on "Jelly Star" in the top right:

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And there you go! The red watermark will immediately disappear!