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Unihertz Jelly Pro N (unihertz-nanot)

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Unihertz Jelly Pro N
Manufacturer Unihertz
Name Jelly Pro N
Codename unihertz-nanot
Released 2017
Type handset
Hardware
Chipset MediaTek MT6737T
CPU 4x ARM Cortex-A53
GPU ARM Mali-T720 MP2
Display 240 x 432 IPS LCD, 2.45"
Storage 16GB, 32GB
Memory 2GB, 3GB
Architecture aarch64
Software
Original software
The software and version the device was shipped with.
Android 7.0
Extended version
The most recent supported version from the manufacturer.
Android 8.1
FOSS bootloader no
postmarketOS
Mainline
Instead of a Linux kernel fork, it is possible to run (Close to) Mainline.
yes
pmOS kernel
The kernel version that runs on the device's port.
6.12.0-rc2
Unixbench score
Unixbench Whetstone/Dhrystone score. See Unixbench.
0.0

Contributors

Maintainers

Users owning this device


About

The Unihertz Jelly Pro N is a low-spec phone created to be as compact as possible. The N model was released after the regular one, containing a stronger MT6737T SOC as opposed to the regular Jelly Pro's MT6737M SOC.

Device models

Jelly Jelly Pro Jelly Pro N
pmOS codename unihertz-nanot
Chipset MT6737M MT6737M MT6737T
Storage 8 GB 16 GB 16 GB, 32 GB
Memory 1 GB 2 GB 2 GB, 3 GB
Android 7.0 7.0 / 8.1 7.0 / 8.1
Preloader c223v37mg c223v37m c223v37t

How to identify device model

  • Check the "Build number" in Android system settings → "About phone". It includes "_N_" for the Jelly Pro N.

Unihertz_Jelly_YYYYMMDD
Unihertz_Jelly-Pro_YYYYMMDD
Unihertz_Jelly-Pro_N_YYYYMMDD

  • Boot into factory mode by holding Volume Down+Power. Then select "Version". The first line states the chipset. For the Jelly Pro N it says:
BB Chip   :  mt6737t
MS Board. :  Jelly-Pro
[...]

How to enter flash mode

First, make sure you enter developer mode and enable the "OEM Unlocking" option in Android. Otherwise the device will fail to unlock the bootloader.

Hold Volume Up+Power while booting until the boot logo shows up. (The one with "Powered by Android" on the bottom of the screen.) Then, a screen that says "No Command" will show up. Hold Power and press/release Volume Up to enter recovery mode. Then, click the "Reboot to bootloader" option and you'll be in fastboot mode. Then, run fastboot oem unlock and press Volume Up to select yes.

Reboot the phone and hold the recovery combination again and enter fastboot mode and you should be able to flash.

Installation

Using pmbootstrap

Follow Installation/Using pmbootstrap. When asked for the device's vendor/codename, select Unihertz as the vendor and nanot as the codename.

To flash the image to the device:

  • Enter flashing mode (see #How to enter flash mode)
  • Run pmbootstrap flasher flash_kernel to flash the kernel
  • Run pmbootstrap flasher flash_rootfs

UART

Screen-facing side of the board

UART is located on the back side of the board. Getting to it isn't that hard, as all that needs to be done is to loosen some screws, detach all cables except the screen connector, and gently pry the board out of the plastic clips that hold it in place and flip it over. Be careful to not tug on the screen connector. It is a very strong connector, but still use caution.

The UART used is 1.8v, but that doesn't matter as long as the power wire isn't connected. The Micro USB port shell can be used for ground if needed.

See also