[SOLVED]Bootloader needed (buffalo wzr-1750dhp)

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pitfermi
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PostPosted: Tue Jun 15, 2021 21:11    Post subject: [SOLVED]Bootloader needed (buffalo wzr-1750dhp) Reply with quote
i accidentally messed the bootloader/firmware on my router and need a compatible bootloader for the buffalo wzr-1750dhp
original post of mine: https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=329312

i located the flash and need a programmer to flash bootloader first, then firmware.
the device came with the broadcom CFE bootloader. according to openwrt(https://openwrt.org/toh/buffalo/wzr-1750dhp), it uses the CFE version 6.30.163.18 (r377098)
is there a database with extracted bootloaders from various device I can access and download?
is there a guide on how to flash bootloader?
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AfterShock
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Joined: 17 May 2010
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PostPosted: Wed Jun 16, 2021 0:30    Post subject: Reply with quote
I have a CFE.bin for the buffalo wzr-1750dhp, it's the non EU/JAPAN version so I'm not sure if it matters or not but at this point your not left with too many options besides just replacing the router, I'll attach it here if I can. Found this but haven't read through the procedure.
https://wiki.dd-wrt.com/wiki/index.php/CFE_backup

Moderator edit: Attachment removed by user due to being a junk file containing all FFs.


Last edited by AfterShock on Wed Jun 16, 2021 22:38; edited 1 time in total
pitfermi
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PostPosted: Wed Jun 16, 2021 7:03    Post subject: Reply with quote
AfterShock wrote:
I have a CFE.bin for the buffalo wzr-1750dhp, it's the non EU/JAPAN version so I'm not sure if it matters or not but at this point your not left with too many options besides just replacing the router, I'll attach it here if I can. Found this but haven't read through the procedure.
https://wiki.dd-wrt.com/wiki/index.php/CFE_backup

hi. thanks a lot for this. every bit of help towards debricking is appreciated.
may i ask where you have it? it should be compatible, since i checked the flash memory being the same as the non eu version. can you confirm?
zentel a5u1ga31ats-bc
kernel-panic69
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PostPosted: Wed Jun 16, 2021 13:33    Post subject: Reply with quote
That's a huge cfe.bin. Proceed with caution. And I am pretty sure that your existing CFE is *not* fried. Perhaps there is a new issue with PuTTY and you need to try an older version; or again, check your connections. It could also be a Windows issue. This is why I keep some antiques in service on the workbench.
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AfterShock
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PostPosted: Wed Jun 16, 2021 13:34    Post subject: Reply with quote
did you download it? As far as I can tell from reading forums the only difference is if you use the buffalo non dd wrt firmware.
pitfermi
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PostPosted: Wed Jun 16, 2021 15:20    Post subject: Reply with quote
AfterShock wrote:
did you download it? As far as I can tell from reading forums the only difference is if you use the buffalo non dd wrt firmware.

yes i did download it.
I have a nand programmer from aliexpress on the way to use as a last resort and program the flash.
https://a.aliexpress.com/_u8LdFH

@kernel-panic69
as i wrote in the other thread, the uart stopped responding/outputting right after i erased nvram and/or flashed an oem firmware. it still outputs weird characters right when i press the power button, but ctrl c doesnt do anything. tried other serial terminal software too. same usb ttl adapter with a wrt54gl works just fine on any terminal and cfe boots properly
AfterShock
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PostPosted: Wed Jun 16, 2021 15:56    Post subject: Reply with quote
best of luck, I backed up the cfe using the web interface, telnet and jtag and the files are identical, just wanted to make sure once version wasn't different from another
lfb
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PostPosted: Wed Jun 16, 2021 17:44    Post subject: Reply with quote
AfterShock wrote:
I have a CFE.bin for the buffalo wzr-1750dhp, it's the non EU/JAPAN version so I'm not sure if it matters or not but at this point your not left with too many options besides just replacing the router, I'll attach it here if I can. Found this but haven't read through the procedure.
https://wiki.dd-wrt.com/wiki/index.php/CFE_backup
If I look into the file with HxD I see just "FF", it's empty?

Played with my 1750, got a 1MB file with content for mtd0, but it's composed? of a CFE, TMPR? and nvram_cfe=mtd1 and nvram=mtd2 (containing all settings including WLAN SSIDs and passphrases in clear text)

00000 CFE
40000 TMPR ??
60000 copy of mtd2 = nvram
70000 copy of mtd1 = nvram_cfe
80000 copy of CFE
C0000 copy of TMPR ??
E0000 copy of mtd2 = nvram
F0000 copy of mtd1 = nvram_cfe


cat /proc/mtd
mtd0: 00100000 00010000 "boot"
mtd1: 00010000 00010000 "nvram_cfe"
mtd2: 00010000 00010000 "nvram"
mtd3: 02000000 00020000 "linux" (= DD-WRT)
mtd4: 01e20000 00020000 "rootfs"
mtd5: 06000000 00020000 "ddwrt" (= empty)
pitfermi
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PostPosted: Wed Jun 16, 2021 20:04    Post subject: Reply with quote
Yea, AfterShock's .bin does not seem right. Any chance you can share yours, @lfb ?
lfb wrote:
AfterShock wrote:
I have a CFE.bin for the buffalo wzr-1750dhp, it's the non EU/JAPAN version so I'm not sure if it matters or not but at this point your not left with too many options besides just replacing the router, I'll attach it here if I can. Found this but haven't read through the procedure.
https://wiki.dd-wrt.com/wiki/index.php/CFE_backup
If I look into the file with HxD I see just "FF", it's empty?

Played with my 1750, got a 1MB file with content for mtd0, but it's composed? of a CFE, TMPR? and nvram_cfe=mtd1 and nvram=mtd2 (containing all settings including WLAN SSIDs and passphrases in clear text)

00000 CFE
40000 TMPR ??
60000 copy of mtd2 = nvram
70000 copy of mtd1 = nvram_cfe
80000 copy of CFE
C0000 copy of TMPR ??
E0000 copy of mtd2 = nvram
F0000 copy of mtd1 = nvram_cfe


cat /proc/mtd
mtd0: 00100000 00010000 "boot"
mtd1: 00010000 00010000 "nvram_cfe"
mtd2: 00010000 00010000 "nvram"
mtd3: 02000000 00020000 "linux" (= DD-WRT)
mtd4: 01e20000 00020000 "rootfs"
mtd5: 06000000 00020000 "ddwrt" (= empty)
pitfermi
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PostPosted: Thu Jun 17, 2021 18:07    Post subject: Reply with quote
can someone share a working bootloader? Smile
Wildlion
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PostPosted: Fri Jun 18, 2021 1:11    Post subject: Reply with quote
I was looking through my files and I have this one for a Buffalo_WZR_1750DHP from 2015.

Based on the notes it looks like I followed the dd procedure from:
https://wiki.dd-wrt.com/wiki/index.php/CFE_backup

Hopefully this helps?

sha1sum:
a2f91d402b853ef331983831f3a590ddd82f798d cfe.bin



cfe.bin
 Description:

Download
 Filename:  cfe.bin
 Filesize:  1 MB
 Downloaded:  198 Time(s)

kernel-panic69
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PostPosted: Fri Jun 18, 2021 4:19    Post subject: Reply with quote
Ok, why was @AfterShock's post / attachment removed ? I never got a chance to analyze it? Gee, I might as well remove every other post, since continuity is now completely fubar'd. This is the kind of nonsense that makes threads confusing and useless.
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pitfermi
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Joined: 06 Jun 2021
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PostPosted: Fri Jun 18, 2021 7:10    Post subject: Reply with quote
kernel-panic69 wrote:
Ok, why was @AfterShock's post / attachment removed ? I never got a chance to analyze it? Gee, I might as well remove every other post, since continuity is now completely fubar'd. This is the kind of nonsense that makes threads confusing and useless.

it was all FFs. I guess i can't post it unless they are ok with it?
Wildlion wrote:
I was looking through my files and I have this one for a Buffalo_WZR_1750DHP from 2015.

Based on the notes it looks like I followed the dd procedure from:
https://wiki.dd-wrt.com/wiki/index.php/CFE_backup

Hopefully this helps?

sha1sum:
a2f91d402b853ef331983831f3a590ddd82f798d cfe.bin

this looks good after taking a quick look inside. thanks so much
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