Tena b133

= Identification =

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


 * Model Number: B133
 * Build Number: A20_B133-eng 4.4.4 JDQ39 20140221 test-keys

= Sunxi support =

Current status
Patches are on the mailing list, but there are some issues with the sunxi-3.4 stable kernel and the way the USBCs are configured in the .fex. The sunxi-3.3 kernel does seem to work.

Manual build specifics

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

Everything else is the same as the manual build howto.

= Tips, Tricks, Caveats =

FEL mode
There is a pinhole on the case to reach the recovery button which is near the RJ45 port.

However it is not known if any of the USB ports are of OTG type. So even if the device is put in recovery mode it is not known how to connect the device to a PC.

USB power
When trying to power over USB, do not use a host port from another device, but instead use standalone powersupply still as otherwise the amperage delivered does not suffice.

This is a case where you will run into trouble with your UART adapter if you have connected Vcc.

Power On/Off
There is no power switch, you have to power it down through software and restart it by reattaching the power cable.

= Adding a serial port (voids warranty) =



Note if you are using CA-42 cable u need to attach the VCC.

Device disassembly
Disassembly is easy. Just unscrew the 4 screws concealed below the rubber footpads. Then lift up the TOP cover with a paper cutter. It should pop out with ease. The PCB can be taken out gently from the casing by lifting it up from the end which does NOT carries the connectors. Take care of the wireless antenna that is glued on the edge of the casing. Do NOT desolder the atenna lead unless you really need to. (PS: do not attempt to force out the PCB with sdcard plugged in unless you want to Guillotone your card ).

Locating the UART
There are four pin holes on the board on the left of the 2 memory chips. These holes first needs to be desoldered and then you can solder a 4 pin header block. the pin nearest to the memory banks is the GND to its left are the RX, TX and VCC.

= Pictures =

= Also known as =

= See also =