Unisurf USFT60U7BLK

The Unisurf 7" tablet (Unisurf USFT60U7BLK) was a low cost tablet running Android 6.0 Marshmallow. This exact model may have been available only in Australia. However, the Printed Circuit Board (PCB) includes a "INET-D71B" designation (visible only after after disassembly (below)). It is yet to be confirmed if the information on this page is applicable for other INet D71 devices (for example, in the same way as the Inet_D70_A33 page).

= Identification =

On the back of the device, the following is printed: unisurf  Model:USFT60U7BLK

The PCB has the following silkscreened on it (note that it may be partially hidden under a movable piece): INET-D71B-REV02 Zeng-gc 2014-11-16

In Android, under Settings->About Tablet, you will find:
 * Model Number: USFT60U7BLK
 * Build Number: A33_D71C_U712HB2C_PG.1612215.20170208

= Sunxi support =

Current status
User:Alldinner is working on populating this NDH. A means of entering a FEL mode that initialises to boot1 (as required to run Sunxi-tools) has not yet been found.

HW-Pack
hwpack info is to be determined.

BSP
BSP info is to be determined.

Manual build
You can build things for yourself by following our Manual build howto and by choosing from the configurations available below.

Mainline U-Boot
Use the  build target.

Mainline kernel
Use the  device-tree binary.

= Tips, Tricks, Caveats =

FEL mode
FEL mode is accessed by using the VOL+ button as follows:
 * 1) Press and hold the VOL+ key.
 * 2) Press and hold the power key for about 2 seconds.
 * 3) Release the power key, and press it at least 3 times immediately.

Note that the screen will remain black. To verify that the tablet is actually in FEL mode,
 * will display

yields: AWUSBFEX soc=00001667(A33) 00000001 ver=0001 44 08 scratchpad=00007e00 00000000 00000000

While it is possible to query the device version at this stage, reading anything further results in failure with the error: usb_bulk_send ERROR -7: Operation timed out

Android Recovery mode
Pressing and holding the VOL- button along with the power button (for approximately 10 seconds) during start up triggers Android Recovery mode. This is not to be confused with FEL mode. The Android Recovery mode is identified by a screen that displays the following at the top of the screen:

Android Recovery Allwinner/astar_ibt/astar-ibt 6.0.1/MOB30R/20170208 eng/test-keys

= Adding a serial port (voids warranty) =



There are no obvious UART connections on the mainboard.

Device disassembly
There are 24 plastic pins to pop around the perimeter of the back cover. A plastic tool is highly recommended, particularly any <1 mm thick, high density plastic or otherwise rigid sheet-like edge that can be inserted into an initial gap and then run around the perimeter without buckling.

The most difficult segments to pop are the bottom right and bottom left corners, because they have pins in the middle of the corner curve. This also makes it particularly difficult to pop the right short side (the side with the mic port), and the left short side near the USB port. A suggested approach would be to pop as much as possible all around (including these difficult segments), then lever off the cover along one of the long edges.

Note also that the power and volume button moulding is a small, loose part that can fall out in the process.

The PCB is attached to the plastic housing by several (TBD) small screws, and also attached to ribbon cables. Complete disassembly instructions to be added.

Locating the UART
There are no obvious UART (RX, TX or GND) pins. Some of the 'TF card' [sic] slot pins produce signals during boot/operation, which may suggest that the UART is multiplexed with the microSD card and that a microSD breakout may be beneficial to access the UART.

= Pictures =

= Schematic =

= Also known as =

= See also =


 * User Manual
 * Inet_D70_A33