Semi-Bricked Tp-WDR4300 with u-boot mod

Installing and Using OpenWrt
1

Hi there. Sorry for my bad english.

I had a WDR4300 with openwrt 18.06.2. I decided to overclock them using the pepe2k mod method. I flashed the Openwrt 14, keep the modded u-boot inside the openwrt folder, changed the bits to set the cpu clock and flashed it with u-boot-upgrade.
After that i rebooted the router.
Now i have a switch. No wifi, no serial, no Luci, no ssh. It simply behaves like a switch. Take internet from the ethernet cable from the modem and redirect to other ethernet.
Led working, internet working but no chance to access it.

Do you have a solution?

Really tanks in advace.

2

Your symptoms sound like the SoC isn't able to run at the rates you have configured, or the configuration was not correct.

Hope that you can connect with serial, get a U-Boot prompt and install a proper boot loader without overclock. Best would be your backup of the original and its settings.

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3

Ask @pepe2k.

4

What do you mean by changed the bits to set the cpu clock? Anyway, assuming you flashed correct U-Boot image, power down the router, press and keep pressed the reset button, then power on. It should start with default/safe clocks (400/400/200 MHz). If not, use JTAG or reprogram flash memory with external programmer.

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5

Thanks for the replay.

According to this i changed the bits with this

CPU/DDR/AHB: 720/480/240 (CPU_FACTOR=144 DDR_FACTOR=96)
CPU_PLL_DATA: 4240
DDR_PLL_DATA: 4180

Unfortunately keeping pressed reset button does nothing, so i probably need an JTAG programmer...

6

This is wrong.

Yes.

7

Unfortunately it is reported here too (post #4), so I assumed it's correct.

Ok. thanks for all, even for your work with u-boot.
If you have some documentation on how to debrick this (or similar) router with JTAG it will be greatly appreciated.

8

This post is from 2015 and AFAIK it's about modifying original U-Boot image, not my modification.

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