[FS#3971] Zyxel nbg-419v2 bootloop

[OpenWrt Bugs]

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

User who did this - diego0815 (diego0815) 

Attached to Project - OpenWrt/LEDE Project
Summary - Zyxel nbg-419v2 bootloop
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 - after upgrading my zyxel nbg-419v2 to 2021.02RC4 i noticed a bootloop

when connecting the serial cable it turned out to be a kernel unpacking issue:

raspi_read: from:50000 len:40 
.   Image Name:   MIPS OpenWrt Linux-5.4.137
   Created:      2021-07-31  17:21:01 UTC
   Image Type:   MIPS Linux Kernel Image (lzma compressed)
   Data Size:    1496161 Bytes =  1.4 MB
   Load Address: 80000000
   Entry Point:  80000000
raspi_read: from:50040 len:16d461 
.......................   Verifying Checksum ... OK
   Uncompressing Kernel Image ... LZMA ERROR 1 - must RESET board to recover


U-Boot 1.1.3 (Jun  9 2012 - 07:23:11)

Board: Ralink APSoC DRAM:  64 MB
relocate_code Pointer at: 83fac000
******************************
Software System Reset Occurred
******************************
spi_wait_nsec: 3c 
spi device id: c2 20 17 c2 20 (2017c220)
find flash: MX25L6405D


once i managed flashing 19.07.08 via tftp it works again as expected.

unfortunately [[https://openwrt.org/toh/zyxel/nbg-419n_v2#oem_installation_using_the_tftp_method|the wiki]] was more misleading than helping, especally the magic number is wrong, it seems the right one is already in the normal images, so changing makes things worse.

More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3971

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