R7800 only works with 1 Build. (Other builds loop) :?

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blkt
DD-WRT Guru


Joined: 20 Jan 2019
Posts: 5700

PostPosted: Wed Mar 24, 2021 11:49    Post subject: Reply with quote
BS factory-to-ddwrt.img is not accepted by stock firmware, voodoo, but was recommending TFTP anyway.

Once again, because Windows TFTP command is blah. Tftpd32 portables -> tftpd32.464.zip, tftpd32.452.zip

For Tftpd32 see anticipation window, a checkbox and value in Tftpd32 settings under advanced tftp options.
This is a way to speed up the transfer if the router for some reason times out, try setting value 1024 bytes.

https://kb.netgear.com/000059633/How-to-upload-firmware-to-a-NETGEAR-router-using-TFTP-client

All Stock Firmwares & 1.0.2.80, r46166 HTTPS & FTP, Install Guide by egc, different versions and nand bad.
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ho1Aetoo
DD-WRT Guru


Joined: 19 Feb 2019
Posts: 2999
Location: Germany

PostPosted: Wed Mar 24, 2021 13:33    Post subject: Reply with quote
Quote:
BS factory-to-ddwrt.img is not accepted by stock firmware,


with the current netgear firmware (R7800-V1.0.2.80.img) it works, i tested it myself before

with older Netgear firmware versions it does not work, they are probably too old.
(I have tested R7800-V1.0.2.28.img)


Last edited by ho1Aetoo on Wed Mar 24, 2021 17:01; edited 1 time in total
fourbin
DD-WRT Novice


Joined: 15 May 2019
Posts: 18

PostPosted: Wed Mar 24, 2021 14:07    Post subject: Reply with quote
In the case of this particular router, using TFTP to load any of the BS factory-to-ddwrt.img files does not work. I even went back and tried a few other builds just to see if they would work after 46069 didn't (r41517 r42287 r45632).

After those failed attempts which all put the router into boot loop. Used TFTP to load 40270 back onto the router, which worked.

My experience thus far has been that whatever firmware worked or didn't work in the WebGUI gave the same results with TFTP.

I'm not making any claims to what would work on a router that is functioning properly.
johnnyNobody999
DD-WRT Guru


Joined: 10 Jan 2014
Posts: 504

PostPosted: Sat Mar 27, 2021 18:17    Post subject: Reply with quote
ho1Aetoo wrote:
Quote:
BS factory-to-ddwrt.img is not accepted by stock firmware,


with the current netgear firmware (R7800-V1.0.2.80.img) it works, i tested it myself before

with older Netgear firmware versions it does not work, they are probably too old.
(I have tested R7800-V1.0.2.28.img)


I used R7800-V1.0.2.68.img and had the same problem with trying to flash the factory-to-ddwrt.img.

In case anyone is interested, atftp with minicom on Ubuntu linux worked great doing the serial port flash.

I couldn't see nvram variables with minicom though, this is what I got on the serial port:

U-Boot 2012.07 [local,local] (Sep 03 2015 - 17:33:2Cool

U-boot 2012.07 dni1 V0.4 for DNI HW ID: 29764958 NOR flash 0MB; NAND flash 128Me
smem ram ptable found: ver: 0 len: 5
DRAM: 491 MiB
NAND: SF: Unsupported manufacturer 00
ipq_spi: SPI Flash not found (bus/cs/speed/mode) = (0/0/48000000/0)
128 MiB
MMC:
*** Warning - bad CRC, using default environment

PCI0 Link Intialized
PCI1 Link Intialized
In: serial
Out: serial
Err: serial
131072 bytes read: OK
MMC Device 0 not found
cdp: get part failed for 0:HLOS
Net: MAC1 addr:##:##:##:##:##:##
athrs17_reg_init: complete
athrs17_vlan_config ...done
S17c init done
MAC2 addr:##:##:##:##:##:##
eth0, eth1
Hit any key to stop autoboot: 0
(IPQ) #
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