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YBKJ A20-Device front.jpg
Manufacturer Unknown
Dimensions 90mm x 120mm x 30mm
Release Date Unknown
Website Unknown
SoC A20 @ 1Ghz
DRAM 512MiB DDR3 @ 432MHz
Power DC 5V @ 2A
Video HDMI (Type A - full), Composite
Audio 3.5mm headphone plug, HDMI, SPDIF
Network WiFi 802.11 b/g/n (Realtek RTL8188ETV), 10/100Mbps Ethernet (Realtek RTL8201CP)
Storage SD
USB 2 USB2.0 Host, No USB2.0 OTG
Other IRDA
Headers UART

This page needs to be properly filled according to the New Device Howto and the New Device Page guide.


PCB Board marked with "YBKJ_A20_V3.0". There are no other identifiable markings.

In android, under Settings->About Tablet, you will find:

  • Model Number: SoftwinerEvb
  • Build Number: sugar_ref001-eng 4.2.2 JDQ39 20131115 test-keys
  • Android Kernel: 3.3.0 zhoujiequan@zhoujiequan-desktop #25

Sunxi support

Current status

  • U-boot patch still missing.
  • Sunxi kernel 3.4 + Debian armhf confirmed working
  • No DTB for mainline yet.

Manual build

  • For building u-boot, use the "MANUFACTURER_DEVICE" target.
  • The .fex file can be found in sunxi-boards as ybkj_a20.fex

Everything else is the same as the manual build howto.

Tips, Tricks, Caveats

FEL mode

There is no USB OTG so FEL mode is pointless. However, it can be triggered by sending '2' via the serial console as normal.

Adding a serial port (voids warranty)


Device disassembly

Lid is held on with a few plastic clips. I was able to remove it without any tools as it was quite loose. Just pull it off with your fingernails.

Locating the UART

Connector J10 is conveniently silk screened with pinout for serial port. Just solder on jumper leads according to our UART howto.


Take some pictures of your device, upload them, and add them here. DO NOT UPLOAD PICTURES WHICH YOU PLUCKED OFF THE INTERNET.

Also known as

Gather some names.

Sold under many descriptions on Ebay.

See also

There's another board with the exact same PCB labelled TXCZ_A20_V3.0 but with different chips (so, would require different kernel modules).