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Txcz a20 front.jpg
Manufacturer Shenzhen Tianxing Chuangzhan Electronic Co., Ltd.
Dimensions 89mm x 145mm x 24mm
Website Missing.
SoC A20 @ 1Ghz
DRAM 512MiB DDR3 @ 384MHz
Power DC 5V @ 2A
Video HDMI (Type A - full), 3.5mm A/V connector.
Audio 3.5mm A/V connector, HDMI, SPDIF
Network WiFi 802.11 b/g/n (Realtek RTL8188ETV), 10/100Mbps Ethernet (ICplus IP101A)
Storage SD
USB 3 USB2.0 Host
Other IRDA
Headers UART pads

This HTPC uses the same formfactor as the Langcent H6S but has a different board and therefor different settings.


The board has "TXCZ_A20_V1.0" printed on it. (There are some other devices existing with different versions numbers such as TXCZ_A20_V3.0 but they have a completely different form factor. They do report using the same model and similar build number, though, so perhaps they're compatible.)

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

  • Model Number: BBA22
  • Build Number: BBA22-UI4-V2.0.4

Sunxi support

Current status


Issue: There appears to be some issues with the PHY drivers. This results in not being able to properly detect if a cable is connected to the ethernet port (it thinks there's always one connected regardless). If you're using a connection manager that tries to maintain a single connection you'll have problems.




Manual build

  • For building u-boot, use the TXCZ_A20 target.
  • The .fex file can be found in sunxi-boards as txcz_a20.fex

Everything else is the same as the manual build howto.

Tips, Tricks, Caveats

FEL mode

Due to a lack of USB device ports, FEL is not possible.

Adding a serial port (voids warranty)

UART pads

Device disassembly

There are no screws, only plastic clips. There is one clip on each of the 4 corners and one in the middle of each side excluding the back (so 7 clips in total). Just turn the device upside down and gently push your plastic tool between bottom and top cover until they release.

Locating the UART

There is a 4 hole connector labeled J10, all you need to do is solder on some wires according to our UART howto.


Manufacturer provided pictures of a pre-production board:

Also known as

  • Ninss Tech BBA22
  • Ninss Tech BAA22
  • Visson Android Tv Box H1
  • Visson Android Tv Box H3 (slightly different plastic box, but same inside)
  • Sunchip SDK-728 and SDK-828 (looks identical, but needs verification)

See also

  • Langcent H6S: a highly similar device using the same formfactor.

Manufacturer images