So that it can be flashable on all Technicolor TG789vac v2?

My ISP modified OpenWRT and put it on its routers. The router can read and flash third party firmware reading them from a tftp server.

My question is: is it possible to create a re-snapshable firmware file of the stock (OpenWRT 99%) one?

I googled, but this is a delicate question, so I thought it would be better to ask here.

Thanks in advance!

p.s. I have root access via SSH.

BusyBox v1.23.2 (2017-03-09 02:08:29 UTC) built-in shell (ash)

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                N E X T   G E N E R A T I O N   G A T E W A Y

 NG GATEWAY SIGNATURE DRINK
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  * 1 oz Vodka          Pour all ingredients into mixing
  * 1 oz Triple Sec     tin with ice, strain into glass.
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Product: vant-6
Release: Aqua (16.3)
Version: 16.3.7636-2921002-20170419153951-718b590506a915e24be58946f4755c0c617d9c8d


Hash config:         718b590506a915e24be58946f4755c0c617d9c8d
Hash openwrt:        6c42ccd019341602a510e4984926f77957cec937
Hash kernel:         0fbe1548eadea50c295b8b839aee7a52668c8325
Hash packages:       0f8aa1264d7a3bf6e4304f0f8ddfdabc4ddac7e4
Hash technicolor:    12432aba3b37fe3a9fda3bd9cc4e8da3fa5fbb40
Hash routing:        7b853f235ce96cd14f3abaebf9253c5ca7f72f7d
Hash lte:            91e34310893a4c4e7a9093cd3866924c285deb6b
Hash custo:          27310c4b16dc4c0fbdfc8d2591680dc10a609083
Hash mindspeed:      91b6a7a4d703268d6023c3a58da3d33fc62e7ed8

Bootloader: 2.0.85

Your ISP is forced by LICENCE to release the sourcecode. Thanks to GPL
Ask the ISP for the full sourcecode. This would be much more helpfull for the community

I'm not sure what the OP is trying to do.  If you have a router running a certain firmware and want to clone that firmware onto another router of exactly the same model, you can make a binary copy of the "firmware" mtd partition and use it as a sysupgrade.

You are completely right! I am still trying to find a tech contact to ask for the source. The fact that it is a build for the Broadcom 63138 is good cause it would add a new supported SoC/platform to the OpenWRT project!

Since I bricked one of this Technicolor router already (shame on me), I'd like to have a firmware image of the one I have now, image which I can flash via TFTP while the router is in bootloader mode (it uses dhcp to get ip and image name, reads it from pc tftp server and flash it, the images are in .rbi format)

So, I found this:

wiki.openwrt.org/doc/howto/generic.backup

where a script makes dd images of the mtd partitions, but I believe this is not enough to create a flashable image with the tftp method.

Thanks you both for your answers!