Boots for me, I’ll take a look at battery consumption.
Gigaset GS4 (GS4)
SoC: Mediatek Helio P70 MT6771
Stock Android 11.0 V23 (A11) Kernel: 4.14.186
Android recovery
GSI 2.9-a14-20250403-CUSTOM-gsi_arm64 dev signed by @Colors
4G LTE
WLAN Wi-fi
Cam/e/ras
Fingerprint (rear-mounted) fast & reliable
Bluetooth remains deactivated although switched on; the BT button is only displayed as a light gray oval with a dark gray circle; no connection possible.
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Cross-Check
GSI (A14) iode-5.11-20250401-arm64_ab (beta) by @iode.tech
Bluetooth works (after Phh Treble Settengs > Misc features > Bluetooth > Bluetooth worksarounds > Mediatek)
Update
Gigaset GS5 (GS5)
SoC: Mediatek Helio G85 k68v1 MT6768
Stock Android 13.0 V14 (A13)
Android 13 Recovery
4G LTE - SIM card is recognized, GS5 rings but no call possible
Bluetooth - BT device is recognized and activated, but no connection is established.
rephone (rephone)
SoC: Mediatek Helio G85 k68v1 MT6768
Stock Android 12.0 V18 (A12)
Android 12 Recovery
4G LTE - SIM card is recognized, rephone rings but no call possible
Bluetooth - BT device is recognized and activated, but no connection is established.
Update N° 2 - Cross-Check
rephone (rephone)
SoC: Mediatek Helio G85 k68v1 MT6768
Stock Android 12.0 V18 (A12)
Android 12 Recovery
GSI (A15) VoltageOS-microg-arm64-ab-4.2-20250321.123212-UNOFFICIAL by @cawilliamson
Bluetooth works (BT is recognized + activated without any setting changes)
4G LTE - SIM card is recognized, rephone rings but no call possible.
https://sourceforge.net/projects/e-os/files/GSI/2.9-a14-20250406-CUSTOM-arm64_bvN.img.xz/download
https://sourceforge.net/projects/e-os/files/GSI/2.9-a14-20250406-CUSTOM-gsi_arm64.img.xz/download
Please test between the two compilations. It’s all I can do, at least now… One is in the Phusson-AndyCGYan style and the other is the GSI development from eOS.
They both had patches applied to them…
Added Two-pane_layout_in_Settings.
Well… this layout has no icons.
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I will test it in the next few days.
I’m currently testing all of them. One question - on which apps did you notice high battery consumption?
I’m using some apps that are always active in the background, I’ve disabled battery manager, wifi is on and auto sync too and battery life is great.
I haven’t tested any apps. After installing the system I left the wireless on and the tablet on standby. High consumption can only be specific to my tablet, I do not know… I mean the A14. The A13 has a very low comparative consumption. But I’m glad to know that’s not the case for all devices.
Battery life is good, the biggest problem is what Xxpsilon noticed - on some devices bluetooth doesn’t work while on others there are no problems.
Bluetooth problem for affected devices is present on all three versions of the GSI.
There are only two A14 versions. gsi_arm64 and arm64_bvN. Two-pane_layout_in_Settings is just a replacement of the original settings menu. Probably the bluetooth issue can be solved from phh Settings. Have you tried?
The only advantage I noticed with the gsi_arm64 version was the lower memory consumption, around 1,7 GB vs 2,0 GB for the arm64_bvN version.
For the e-3.0-a14 i will build only the version with phh settings.
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e-3.0 !
major version means new features !
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The better; it will be a hit. 
Yes, that is clever and the right way to achieve the d/e/sired solution.