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GoClever Quantum 700N (goclever-tq700n)

From postmarketOS Wiki
This device has been tested with postmarketOS, but its device package has not yet been added to the postmarketOS repositories.
This means that it cannot be selected in pmbootstrap.
GoClever Quantum 700N
GoClever Quantum 700N booting Linux 6.14
GoClever Quantum 700N booting Linux 6.14
Manufacturer GoClever
Name Quantum 700N
Codename goclever-tq700n
Model TQ700N
Released 2014
Type tablet
Hardware
Chipset MediaTek MT8127
CPU Quad-Core Cortex A7 1.3 GHz
GPU Mali-450 MP4
Display 1024x600 TFT
Storage 8 GB NAND
Memory 512 MB
Architecture armv7
Software
Original software Android
Original version 4.4.2
FOSS bootloader no
postmarketOS
Category testing
Pre-built images no
Mainline partial
Features
Flashing
Broken
USB Networking
Broken
Internal storage
Broken
SD card
Broken
Battery
Broken
Screen
Broken
Touchscreen
Broken
Multimedia
3D Acceleration
Broken
Audio
Broken
Camera
Broken
Connectivity
WiFi
Broken
Bluetooth
Broken
GPS
Broken
Miscellaneous
FDE
No data
USB OTG
Broken
HDMI/DP
Broken
Sensors
Accelerometer
Broken
Proximity
Broken
U-Boot
Primary Bootloader
Works
Secondary Bootloader
Broken
Mainline
Broken
Internal Storage
Works
SD card
Broken
USB Host
Broken
USB Peripheral
Broken
Display
Works
Buttons
Broken


Contributors

Users owning this device

  • Illen (Notes: Broken touchscreen)


How to enter flash mode

Warning WARNING: Leaving the device running fastboot or mainline kernel indefinitely will deplete its battery and brick it if it doesn't have a vendor boot image.

Run mtkclient with mtk meta FASTBOOT command and connect the powered off device to host. Alternatively you can run adb reboot-bootloader when the device runs Android with USB debugging enabled. Unfortunately mtkclient cannot directly flash the device right now.

Installation

There is no support for NAND, SD or USB in mainline. All you can do right now is just flash the boot image with Linux kernel and pmOS ramdisk, and look at the simple-framebuffer output. It is recommended to back up the vendor boot image first, it can be done with adb pull /dev/block/mtdblock6 boot.img when running Android. The boot partition is only 8 MB, so it is recommended to split initramfs into extra package and use high compression for kernel and ramdisk. Before generating the boot image, you will need to prepend the MediaTek boot header to the kernel and ramdisk using mtk-mkimage from pmaports. Use KERNEL label for kernel and ROOTFS label for ramdisk.

Recovering a bricked device with weak battery and custom boot image

Fortunately it is not hard to recover a bricked device. Connect the device to host and run dmesg -w in terminal, you should see ttyACM0 device appearing and then disconnecting shortly after. After resetting the device (with a button hidden in small hole on back panel, next to the SD card slot) it will appear in dmesg and then disconnect again. You have to reset the device repeatedly, about 5 seconds after each time you see the USB disconnect message, until the battery reaches 3.3V and device starts booting again. Once the screen lights up, quickly reset the device, run mtk meta FASTBOOT command on your host, flash the vendor boot image and reboot. The device should be able to charge by itself from now on.

See also