Bricked UAP AC LR

Installing and Using OpenWrt
1

i got a pair of UniFi AP AC LR to extend my wifi coverage.
I followed the steps described here:

I used the "Non-invasive method using dd" method, it seems to be the easiest...
Every step seemed to work, i executed the last "Reboot" command and the AP rebooted...
But is unreachable now.. Nothing on 192.168.1.1 or 192.168.1.20
I tried to reset it using the push button, but this caused a permanent LED Color loop (white- blue- black)

I think my mistake was to not delete the mdtblock3
X Alternatively, delete kernel1 dd if=/dev/zero f=/dev/mtdblock3
is it possible that this caused the AP to brick?

How can i recover the device?

2

This may be as simple as a jammed reset button, but in general this is actually an okay state to be in because it is the Unifi boot loader which is ready to accept an image via tftp.

https://help.ui.com/hc/en-us/articles/360043360253-UniFi-Recovery-Mode

You'll probably want to flash it with the Unifi firmware to make sure it recovers properly, and then go from there to install OpenWrt.

3

Thanks for the quick help.
I successfully flashed the Unifi Firmware back onto the AP.
I choosed the 6.0.14 because i cannot find the recommended 6.5.28 on the Unifi Releases Pages.

But now i am back from where i started...
Which approach should i try next?
Or maybe i did a mistake during my first try..

What do you suggest?

4

TFTP recovery only accepts signed firmware. There is an older relaeses button to get older firmware.

5

yes i read that too!
The recovery worked perfectly :slight_smile:

But i still want OpenWRT :stuck_out_tongue:

6

Since recovery is easy, I'd recommend that you repeat the standard installation process you had tried previously. This time, go slowly and methodically in case you made a typo or missed a step in the initial installation. If it bricks again, recover with TFTP again and then consider one of the other options, possibly including the more invasive methods.

7

okay will do!
What about the deletion of the mdtblock3 i mentions earlier?
Should i do this step?
I was confused bc the text says Alternatively

8

I actually don't know. I have a these APs, but I actually run them on the Unifi stack so I haven't ever tried to install OpenWrt onto them. Hopefully this thread will be seen by other users who have direct experience installing OpenWrt onto this hardware.

9

alright then, i will try my best!
Maybe im back with a solution later :slight_smile:

Anyway, thanks for your quick answers! Keeps me motivated :slight_smile:

10

sooo it didn't work the second time.
now i am too afraid to permanently break something.
I flashed the 6.0.14 on the AP again.

Is someone out there who is willing to help me?

Thank you!

11

here is the output of the AP terminal:

UAP-AC-LR-BZ.6.0.14# echo "5edfacbf" > /proc/ubnthal/.uf
-ash: can't create /proc/ubnthal/.uf: nonexistent directory

UAP-AC-LR-BZ.6.0.14# dd if=/tmp/sysupgrade.bin of=/dev/mtdblock2
12828+1 records in
12828+1 records out

UAP-AC-LR-BZ.6.0.14# dd if=/tmp/sysupgrade.bin of=/dev/mtdblock3
12828+1 records in
12828+1 records out

UAP-AC-LR-BZ.6.0.14# dd if=/dev/zero of=/dev/mtdblock3
dd: writing '/dev/mtdblock3': No space left on device
15489+0 records in
15488+0 records out

UAP-AC-LR-BZ.6.0.14# dd if=/dev/zero bs=1 count=1 of=/dev/mtdblock4
1+0 records in
1+0 records out

UAP-AC-LR-BZ.6.0.14# reboot
12

Hey, I managed to flash my AC LR unit using the "Non-invasive method using mtd from unifi" and it works absolutely fine, the link to 3.7.58.6385 firmware is in the first mtd method. Hope that helps

Downgrade your unit and just follow the steps, should work :slight_smile:

essa
essa974×834 24.7 KB

13

It worked!
Thank you!