I have a no name router with the ZBT-WE1026-5G V05 inscription on the board. It has 32M flash ROM. I want to make a firmware for it with a fresh OpenWRT.
But there is only Zbtlink ZBT-WE1026-5G 16M target system. With 32M is Zbtlink ZBT-WE1026-H 32M and Zbtlink ZBT-WE826 32M.
I have the ZBT-WE826 router too. This board is not very similar to the WE1026-5G board.
Is it possible to reasonably assume which target system to choose? What is a WE1026-H?
If it is the same hardware as this one which has 16M you can try this version
Previously back up the original partitions
i have found this:
https://downloads.openwrt.org/releases/22.03.2/targets/ramips/mt7620/openwrt-22.03.2-ramips-mt7620-zbtlink_zbt-we1026-h-32m-squashfs-sysupgrade.bin
How to back up the original partitions in Lede 17.01?
cat /proc/mtd
cat /dev/mtd0 > mtd0.bin
cat /dev/mtd1 > mtd1.bin
cat /dev/mtd2 > mtd2.bin
cat /dev/mtd3 > mtd3.bin
cat /dev/mtd4 > mtd4.bin
cat /dev/mtd5 > mtd5.bin
cat /dev/mtd6 > mtd6.bin
cat /dev/mtd7 > mtd7.bin
cat /dev/mtd8 > mtd8.bin
cat /dev/mtd9 > mtd9.bin
cat /dev/mtd10 > mtd10.bin
cat /dev/mtd11 > mtd11.bin
cat /dev/mtd12 > mtd12.bin
cat /dev/mtd13 > mtd13.bin
After recover mtd files in your computer with SCP or
WinSCP
There are seven partitions: from mtd0 to mtd6.
How to restore them later?
It's not a problem. I copied the partitions to a USB flash drive 
How to write these partitions back to the router? Build a firmware from them? How?
I indicated above where is the firmware in 32M which is available
for restore use luci or ltd write or use mtd write mtd0xxx ( the firmware ) firmware
mtd.xxx matches what you found with cat /proc/mtd
After studying the information, my question sounds like this:
How do I build firmware based on Zbtlink ZBT-WE1026-5G 16M target, but for 32M ROM?
I tried the following firmware:
zbtlink_zbt-we826-32m-squashfs-sysupgrade.bin
zbtlink_zbt-we1026-h-32m-squashfs-sysupgrade.bin
and
zbtlink_zbt-we1026-5g-16m-squashfs-sysupgrade.bin
Only the last one worked. The others result in a cyclical reboot.
And another bad news: modern browsers do not work with the flashing procedure web interface (by power on with pressed reset button). Only the olds. I do not know why.
So how do you still make 32M firmware from 16M?
for 32M firmware requiert to build firmware with sources
modified dts file
old
&firmware {
reg = <0x50000 0xfb0000>;
new
&firmware {
reg = <0x50000 0x1fb0000>;
mt7620.mk with add part for 32M
new image size
IMAGE_SIZE := 32448k
possible some others
Thanks, I already.
Fail.
I added to target/linux/ramips/image/mt7620.mk
define Device/zbtlink_zbt-we1026-5g-32m
SOC := mt7620a
IMAGE_SIZE := 32448k
DEVICE_VENDOR := Zbtlink
DEVICE_MODEL := ZBT-WE1026-5G
DEVICE_VARIANT := 32M
DEVICE_PACKAGES := kmod-mt76x2 kmod-usb2 kmod-usb-ohci kmod-sdhci-mt7620
SUPPORTED_DEVICES += we1026-5g-32m zbtlink,we1026-5g-32m
endef
TARGET_DEVICES += zbtlink_zbt-we1026-5g-32m
and to target/linux/ramips/dts/ file mt7620a_zbtlink_zbt-we1026-5g-32m.dts
// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
#include "mt7620a_zbtlink_zbt-we1026-5g.dtsi"
/ {
compatible = "zbtlink,zbt-we1026-5g-32m", "zbtlink,zbt-we1026-5g",
"zbtlink,zbt-we1026", "ralink,mt7620a-soc";
model = "Zbtlink ZBT-WE1026-5G (32M)";
};
&firmware {
reg = <0x50000 0x1fb0000>;
};
just a copy of mt7620a_zbtlink_zbt-we1026-5g-16m.dts with
reg = <0x50000 0x1fb0000>;
instead reg = <0x50000 0xfb0000>;
After that I build firmware with this profile from make defconfig + LuCI.
The firmware is not working properly: the LAN light does not light up, and there is no connection to the router via LAN cable.
But this zbtlink_zbt-we1026-5g-16m-squashfs-sysupgrade.bin firmware work.
Do I need to specifically configure the LAN when creating the firmware?
Look in:
target/linux/ramips/mt7620/base-files/etc/board.d/02_network
*1
zbtlink,zbt-we1026-5g-16m)
label_mac=$(mtd_get_mac_binary factory 0x4)
;;
*2
zbtlink,zbt-we1026-5g-16m)
ucidef_add_switch "switch0" \
"0:lan" "6t@eth0"
;;
exist also iin target/linux/ramips/mt7620/base-files/etc/board.d/01_leds
*3
zbtlink,zbt-we1026-5g-16m)
ucidef_set_led_netdev "lan" "LAN" "green:lan" "eth0"
ucidef_set_led_netdev "wifi_led" "wifi" "green:wifi" "wlan0"
;;
You cna found files & text with this
find ./ -type f -exec grep -H 'zbt-we1026-5g-16m' {} \;
find ./ -name 'zbt-we1026-5g-16m.*'
I don't have my build machine at home right now, I just had a quick look in github
Thanks.
Probably touch target/linux/*/Makefile is necessary...
So, I have the minimum working firmware from "Zbtlink ZBT-WE1026-5G (32M)" target.
It remains to enabled removable storages and make the modem work...
Something strange...
I removed dropbear and added openssh to firmware.
But I have 'Permission denied' when connecting by ssh. But, like, there shouldn't be a password?
Ok, I set password via LuCI. Same thing.
How to configure openssh in firmware?
DropBear is good enough for me and so, sorry, i have no experience with OpenSSH
Your old post !!!
----------------------------
Tested with this nfos:
https://oldwiki.archive.openwrt.org/inbox/replacingdropbearbyopensshserver
No problem with WinSCP & sftp
my sshd_config
Port 22
HostKey /etc/ssh/ssh_host_rsa_key
HostKey /etc/ssh/ssh_host_ed25519_key
PermitRootLogin yes
AuthorizedKeysFile .ssh/authorized_keys
Subsystem sftp /usr/lib/sftp-serve
Well, I've forgotten a lot of things in life. 
Covid or old age ?
I am 76 years old !!!
60 a month ago
The wi-fi is configured incorrectly.
Only target/linux/ramips/dts/mt7620a_zbtlink_zbt-we1026-5g.dtsi has something about wi-fi. No other zbtlink_zbt-we files contain anything about wi-fi.
How to troubleshoot wi-fi?