Allwinner tablet reset button
Allwinner tablet reset button serial#
FEL itself can/will not talk over the serial connection! In other words: You still have to connect a USB cable to make actual use of FEL and associated tools. Note: This is just an alternative way of entering FEL mode. If "efex" is not available in your U-boot, you can use the simple uboot "go" command with arguments pointing to the return FEL address:Įntering this command at the u-boot prompt will enter into FEL mode. With later SoCs, Allwinner's U-boot supports the "efex" command. If you have access to the UART already, you can send the character '1' ('2' on some devices) to the device during power-up. Release the power key, and press it at least 3 times immediately.Press and hold the power key for about 2 seconds.Press and hold the suspected or reported FEL key.This is usually one of the standard tablet buttons, like the VOL+ key or something. If your device features such a button, you just need to hold it during power-up, and the device should have entered FEL mode just fine. This is either called recovery or uboot or fel. Triggering FEL mode Through a special FEL button So before you power up your device again: disconnect your UART, and re-attach it. Do not leave any cables attached.ĭue to a common design flaw, (current leaking from) the UART will often keep the device in a slightly working state. If you are going to use FEL mode to retrieve device information, you need a to pick a method of entering FEL mode that initializes Boot1.īefore you try to enter FEL mode, make sure that your device is truly powered off. Some do low-level initialization (load Boot0 and Boot1), and some don't. While there are a few different ways to trigger FEL mode, they are not always equal.
If you haven't done so already, retrieve the repository and build it. Our tools repository has some tools for dealing with FEL mode.