TM1900 on dd wrt back to stock

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garce
DD-WRT User


Joined: 24 Aug 2016
Posts: 59

PostPosted: Thu May 06, 2021 0:27    Post subject: TM1900 on dd wrt back to stock Reply with quote
Hi,
I have a TM1900 I purchased on late 2016 and followed the process to convert it to dd wrt. Right now is running Firmware: DD-WRT v3.0-r45229 std (01/01/21)

I have since purchased a AX86u and would like to test aimesh on stock firmware.

My thinking was to simply upgrade the latest ASUSWRT firmware but I was not successful:
a. Firmware recovery tool connect to the device well
b. Latest Asus AC68u Firmware loads through the tool
c. At the end of the load the router reverts to dd wrt screen
d. Repeat above 3-4 times

Since I have learned that there are a couple of things I need to do at least?
1. Ensure the rootfs filesystem is 64 instead of 32?
2. Patch the router so it becomes truly an AC68u (apparently Asus made an effort to detect TM1900 and prevents the update / brick the device?)
3. Anything else before trying the firmware recovery tool as well?
Appreciate if anybody that has done this has some advise. I've not seen instructions specific to my case

PS. To add to my confusion, I ssh to my router and run the command to check filesystem size and got below
root@DD-WRT:~# df -h
Filesystem Size Used Available Use% Mounted on
/dev/root 23.0M 23.0M 0 100% /
root@DD-WRT:~#
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kernel-panic69
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Joined: 08 May 2018
Posts: 14102
Location: Texas, USA

PostPosted: Thu May 06, 2021 5:53    Post subject: Reply with quote
https://wiki.dd-wrt.com/wiki/index.php/Asus_RT-AC68U

https://wiki.dd-wrt.com/wiki/index.php/Asus_T-Mobile_Cellspot

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garce
DD-WRT User


Joined: 24 Aug 2016
Posts: 59

PostPosted: Thu May 06, 2021 21:39    Post subject: Reply with quote
kernel-panic69 wrote:
https://wiki.dd-wrt.com/wiki/index.php/Asus_RT-AC68U

https://wiki.dd-wrt.com/wiki/index.php/Asus_T-Mobile_Cellspot

Thanks I checked the links. It seem that there are a lot of dependencies and have found lengthy guides online.

I was hopping that given my router is from 2016, already running dd-wrt it would be simpler. I can't really figure out the steps or where to approach this
I was also able to capture this info which apparently helps in understand what to do
root@DD-WRT:~# nvram get bl_version
1.0.2.0
root@DD-WRT:~# strings /dev/mtd0 | grep odmpid
odmpid=ASUS
root@DD-WRT:~# strings /dev/mtd5
strings: /dev/mtd5: No such file or directory

Appreciate if one of the gurus has any comments / guidance
garce
DD-WRT User


Joined: 24 Aug 2016
Posts: 59

PostPosted: Fri May 07, 2021 21:40    Post subject: Reply with quote
Answering my own question.
I ended up following the process here
https://www.bayareatechpros.com/ac1900-to-ac68u/

I did the whole thing including going to the original TMO build he starts on (I found mtd-write or mtd-write2 wouldn't work on my build
My router is in mesh mode now (some small hick-ups but ended up working)

For the record and in case it helps
BEFORE (TM1900 migrated to ddwrt in ~2016)
root@DD-WRT:~# nvram get bl_version
1.0.2.0
root@DD-WRT:~# strings /dev/mtd0 | grep odmpid
odmpid=ASUS
root@DD-WRT:~# df -h
Filesystem Size Used Available Use% Mounted on
/dev/root 23.0M 23.0M 0 100% /
root@DD-WRT:~# cat /proc/cpuinfo
model name : ARMv7 Processor rev 0 (v7l)
processor : 0
BogoMIPS : 1594.16
Features : half fastmult edsp tls
CPU implementer : 0x41
CPU architecture: 7
CPU variant : 0x3
CPU part : 0xc09
CPU revision : 0

model name : ARMv7 Processor rev 0 (v7l)
processor : 1
BogoMIPS : 1594.16
Features : half fastmult edsp tls
CPU implementer : 0x41
CPU architecture: 7
CPU variant : 0x3
CPU part : 0xc09
CPU revision : 0

Hardware : Northstar Prototype
Revision : 0000
Serial : 0000000000000000
root@DD-WRT:~# nvram get boardrev
0x1100
root@DD-WRT:~# nvram get HW_ver
170
root@DD-WRT:~# nvram get clkfreq
800,666
root@DD-WRT:~# strings /dev/mtd5
strings: /dev/mtd5: No such file or directory

AFTER THE PROCESS
admin@RT-AC68U-0658:/tmp/home/root# nvram get bl_version
1.0.2.0
admin@RT-AC68U-0658:/tmp/home/root# strings /dev/mtd0 | grep odmpid
odmpid=RT-AC68U
admin@RT-AC68U-0658:/tmp/home/root# df -h
Filesystem Size Used Available Use% Mounted on
rootfs 38.9M 38.9M 0 100% /
/dev/root 38.9M 38.9M 0 100% /
devtmpfs 124.8M 0 124.8M 0% /dev
tmpfs 124.9M 1.4M 123.5M 1% /tmp
/dev/mtdblock4 62.8M 1.7M 61.1M 3% /jffs
admin@RT-AC68U-0658:/tmp/home/root# cat /proc/cpuinfo
Processor : ARMv7 Processor rev 0 (v7l)
processor : 0
BogoMIPS : 1599.07

processor : 1
BogoMIPS : 1599.07

Features : swp half thumb fastmult edsp
CPU implementer : 0x41
CPU architecture: 7
CPU variant : 0x3
CPU part : 0xc09
CPU revision : 0

Hardware : Northstar Prototype
Revision : 0000
Serial : 0000000000000000
admin@RT-AC68U-0658:/tmp/home/root# nvram get boardrev
0x1100
admin@RT-AC68U-0658:/tmp/home/root# nvram get HW_ver
170
admin@RT-AC68U-0658:/tmp/home/root# nvram get clkfreq
800,666
admin@RT-AC68U-0658:/tmp/home/root# strings /dev/mtd5
<< bunch of stuff)
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