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I followed the instructions on the official TWRP site on how to install TWRP on the Kindle Fire. So I did

wget <twrp.img>
adb shell idme bootmode 4002
fastboot -i 0x1949 flash recovery <twrp.img>

But now, my Kindle Fire wont boot. It just shows a yellow triangle. How can I fix it?

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up vote 1 down vote accepted

You need to reset the bootmode. This can be easily done with fastboot. Execute the following commands:

fastboot -i 0×1949 oem idme bootmode 4000
fastboot -i 0×1949 reboot
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