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
 * Kenel : 3.3.0+
 * Firmware version: v1.072

= Sunxi support =

Current status
Most functions are expected to work, currently (05-Apr-2013) The host usb port does not seems to be working. This is being worked upon.

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 =


 * Caveat 1:

Power the device using the AC power adaptor only. One of my TTL to USB adaptors got fried while messing with the power input to device.

There is no power switch on device. Fortunately ACPI is able to turn off the device totally. To turn on you will have to jack(in|out) the power cable.
 * Caveat 2:

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.

= Adding a serial port (voids warranty) =



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. 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
Locating the UART is easy. Pictures shall be posted.

= Pictures =

= Also known as =

= See also =