I got ZTE ZXHN H369A, there is no much information about it on Openwrt or other sources except some information on Tech Info Depot, You can check this link for basic information, but it does not have info about CPU, WLAN / Eth Chips, RAM, Flash, etc.
So, I opened the case and her below the additional information I have so far:
CPU: Broadcom BCM63138 VKFSBG Bootloader: CFE (I guess)
There is Serial pins already so no soldering is needed.
Such serial pins can be found behind the USB port, the one close to the two green PSTN ports.
I connected the serial to the laptop, but only the following was shown:
HELO
4.1603patch1-1.0.38-116.175
CPU0
PMCM
PMCS
AFEL
PWRZ
MEML
APMT
PMCD
L1CD
MMUI
CODE
ZBBS
MAIN
DRAM
PASS
I do not know why there is no more boot logs shown, is it because of bootloader security feature or something else??!!
Uh, another Broadcom-based device...
According to this (i don't know if this page is up-to-date) , this SoC ist still not supported in OpenWrt.
And considering the lack of open source drivers for Broadcom chips, i don't know if it's a good idea to spend too much time with devices like these...
If i remember right, i think i've seen something like this some years ago on a Broadcom-based set-top-box.
My guess is, they just disabled the normal boot messages or send them straight to /dev/nul.
Edit:
Just found this one.
It seems, that's the typical Broadcom boot log
Edit2:
I was missing the part where there were additional boot messages on other devices, an none on this one...
Either a "security" measure (to secure their intellectual property?) or just "You do not need to know this".
That is also my guess, especially the same problem happens on ZXHN H368N router I have.
In the beginning; I thought it was a serial-TTL cable issue, but when I changed the cable, the problem still there. So it is not a cable issue. I guess they made something with boot-loader security.
The boot-loader is CFE (I think) not U-Boot!
EDIT (1):
Now I am sure it is CFE boot-loader. What I did is I turned off the router then pressed Reset button at start-up for 6 seconds. the router has very tiny webserver in this case (micro_httpd), with telnet to the router on port 80 I got the following
it is clear that it is CFE based bootloader router.
also, when the router is in this mode, you can try 192.168.2.254 on web-browser but it asked for username and password which are unknown. I tried many combinations of username/password but in vain
