Hi, I have also tried what you say. No luck.The problem is that since falshin openwrt lan ports doesnt work, any of them.
I did with 192.168.0.66 and 255.255.0.0. Today I have also tried 192.168.0.66 and 255.255.254.0 but doesnt work ( I have tried with each lan ports, 4 times)
This is what I did:
Also with the tplink firmware (back to stock), I CAN'T connecto to my router with lan ports (I tried also new cables and another computer). Wifi is working, but lan ports don't.
@gurangax I have to remove the back sticker to access inside. Is there any posibility of recover it with serial commands? I dont want to remove sticker if I can't do anything without lan ports. What do you think ?
We can check if the LAN drivers are being loaded at all from the serial log. I have read of some people who has the same problem as you. It could be a slight hardware variation i'm not sure if US or EU or etc version has the same hardware. You need to take pictures on the inside to make sure. Can you update to other tplink firmware? try newer firmware.
Thanks, several post ago, I put three official firmwares that I checked. All of them with 4053 error or error 500 unknown.
About serial port. Imagine that the pan's driver is not loaded. Could we find any solution to that ? (I don't have skill to desolder and solder IC's so easy)
4053 error is related to a region difference or try to upgrade with an earlier version.
Perhaps it is because it is a branded device.
I think back_to_stock.bin made by Heinz has some region difference with tplink fw that you are trying to load.
I think it's best to begin update process with all official versions from first to last, to be sure they are compatible.
I found in MR200 openwrt page, this method to revert to a stock fw:
"
Reverting back to the stock firmware
Always revert back to the same version in which you switched from.
Steps:
cut out the first 0x20200 bytes. (tp-link header+bootloader)
cut out the rest of the firmware after 0x7B0000 bytes (LTE modem firmware starts there)
But, you must to build the first .bin, hex editor cutting and pasting like is explained before. If it is succesfull try to load via webgui the following official fw's.
I'm not sure if this method is valid or not, maybe @Gurangax can tell us.
I also found this thread. It is of another device, but it is useful to know where to find regional code in factory.bin. We only need to know the exact position inside mr200 stock bin, to compare values.
The method is correct, but I am not sure if it can be done from tp-link official firmware. It can be done from openwrt but currently he has official firmware. If indeed the error is region related then he can update with the EU region since back to stock is EU region. The problem may also be on the last 3 partition of the flash chip since these partitions is not touched during tftp or webgui firmware update. If he still can not flash openwrt then an external programmer may be needed for backup purpose especially for the last 3 partition. A soic8 test clip will avoid of desoldering the flash chip.
A picture showing the inside will confirm any hardware variations
@ortegafernando out of curiosity I decided to duplicate what you have done.
flash tftp using the mediafire link - everything including LAN is ok - system was openwrt 18.06.1
flash back to stock from openwrt webgui - LAN becomes dead and my router wont fully boot since it wants to find the original modem which is broken, so I can not test flash by wifi
In order for me to restore it, I used an external programmer. LAN is now ok. Everything is working again. So it is the back to stock firmware which is giving the problem, your LAN is not broken. It may be fixed by firmware update. Like previous post you can try first update by wifi with older/oldest version from tp-link, then see if your LAN is working again.
flash back to stock: LAN dead and router doesnt' boot up
MY CASE
flash tftp: lan DEAD
flash back to stock: LAN dead and router boot up and works with wifi perfectly.
About flashing with other versions of tp-link firmware, where could I find other versions than EU versions? I have check ALL EU version (oldest, newest, ....) and everything gives me ERROR 500 UNKNOW.
What external programmer do you use? Can it be an arduino and solder 8 cables to soic 8 without unsoldered it ?
back to stock or any official firmware wont boot my router fully. It is searching for the original modem which I don't have since it is broken, so there is no way for me to use any original tp-link firmware and flash by wifi.
I used Skypro by coright, basically you can use any programmer which supports SPI flash. You will need a soic8 test clip to avoid unsoldering the chip and program it onboard. Before doing any flashing with the programmer please make a full backup/dump the current flash content. The last 3 partitions are important. The file should be 8192KB in size.
It may be possible also to change the tp-link firmware header to trick the router and pass the firmware update process. But since I can not use any tp-link firmware, I can not test it. We still do not know what type of hardware inside your router, it may be the same or maybe different from current supported devices.
Before begining to flash my Mr200 and to avoid any problem like @ortegafernando had.
I am studying to use my raspberry to dump the current rom first.
I found this guide:
So i will order next 11.11 offers one SOIC8 clip, some jumper wire to connect it to rpi and, i'm not sure at all, an simple ch341a usb programmer, that i think it's sufficient for it, in case i have no succes with rpi.
Then i want to flash a C2V1stock_dump.bin uploaded by @gurangax in other post, to update the device with latest official fw.
As i can see it is very important to flash the last 2 partitions, that tftpd and webgui skip.
I suspect @ortegafernando is from Spain like me, and he owns an mr200 from isp Amena or Orange.
First of all, i want to make some photos of my mr200 internals. I will upload it as soon as possible.
Yes Amena/Orange. I will wait your photos. Thanks. I am also talking with tplink if they can help me (I haven't said anything about lan/openwrt/... only about that I have a firmware version XXX that I can't upgrade).
I'm tying to open mr200 but i can't.
I removed the 2 rear screws under the sticker.
But i can't open the plastic cover, i'm afraid to force it and broke something.
You need to open the metal cover. Just pry open the metal cover. there are some chips inside.
I suspect that the last 3 partitions is the culprit for errors since you guys have custom firmwares from ISP. And I think that a full reflash of chip using official tp-link will solve your problem, or change any mr200 into official tp-link and remove restrictions from your ISP
If you have mt7620 cpu then it should be the same mr200 v1 supported device. The difference left is the firmware. You will need to copy your mac address from the partition starting from 0x7d0000 - 0x7e0000 (64KiB). All the rest can be from the C2V1stock_dump file you mentioned earlier. This will convert from your ISP custom firmware to official tp-link firmware.
You can use then https://github.com/Marzogh/SPIMemory to get the backup. I don't know how to flash it. Please, publishthe backup as I can use it to recover my mr200.
