[FS#3927] OpenWrt 21.02.0-rc3 bricks Netgear WNDR3700 v4

[OpenWrt Bugs]

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A new Flyspray task has been opened.  Details are below. 

User who did this - Scrotos (Scrotos) 

Attached to Project - OpenWrt/LEDE Project
Summary - OpenWrt 21.02.0-rc3 bricks Netgear WNDR3700 v4
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Critical
Priority - Very Low
Reported Version - openwrt-21.02
Due in Version - Undecided
Due Date - Undecided
Details - I saw the announcement on the website about the next stable release so like an idiot I went to upgrade the firmware.  Router never came back, left it on overnight to see if it would eventually come up.  I was upgrading from 19.07.7.  

Breaking open the case I see a UART header and some pads for a JTAG but I'm not the guy to debug what broke.  I just wanted to give someone else a heads up so they don't lose their router, too.

The debricking guide is some random notes for people who jump into the hardware, not really organized in any understandable way.

https://openwrt.org/docs/guide-user/troubleshooting/generic.debrick

I like the line "The usual recovery methods have failed, forceing the user to to go to JTAG."  Like, where are the usual recovery methods listed?  Not in the debricking guide, they aren't.  

Sorry, it's just frustrating for a somewhat literate user like me (coming from LEDE, 20-ish years in IT/networking/sysadmin crap) that the debricking guide is useless for me.  No "here's the steps the OS takes to initialize" and "here's where a safemode kicks in where you can set some TFTP or here's where you pop into the serial connection via PuTTY" or like a general list of steps in order that you can attempt before working up to "ok solder a JTAG connector, here's a DIGIKey part number to get you started."

Tried Failsafe, Factory Reset, and Recovery all with no dice.

More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3927

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