Yeah. Bummer no doubt. Keep us posted on what support was able to do for you.
Yeah, of course the update can fail, but the UBoot supposed to be a solution for that, like a BIOS in Windows.
Agree with @ollee, after 1 year warranty it’s safer to put the updates on hold, unless the support can offer a solution for cases like that.
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I have two GL-MT2500s, but both of them failed to brick in last few weeks
U-boot still works, so I flashed the official firmware again, but nothing changed.
Based on the situation, I suspect that something went wrong with eMMC, but I can’t be sure.
Just do it. If bricked we will give you exchange.
We may not be able to help for products that is 3 or 4 years old but for less than 2 years surely we can help.
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How do I do an exchnage?
Talk to customer service via email.
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Customer service is sending out a replacement! Thanks GL! 
I am having the same problem. I have had this GL-MT2500 router for at least 1 year, but after the last firmware update, it always gives problems.
Now, I can only access the uboot at http://192.168.1.1. I have already tried many times to send the firmware, and in the end, it says “Upgrade Complete,” but it’s not rebooting to 192.168.8.1.
I have also tried http://192.168.1.1/gpt.html, and it doesn’t give an error, but the same problem persists after rebooting; I can’t access 192.168.8.1.
Any solution or its dead?
After many years working with routers, it’s my first time that I can’t recover a router. 
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What was your solution in the end?
Thank you
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Digging this out, sorry to reply to an old thread.
I have this exact uboot version and the exact problem.
I have tried to skip all firmware updates because I had an issue prior when my old one also bricked.
Support at that time sent me a replacement.
I don't even know why or how if there was an update. I disabled any auto update options. Yesterday I had a power outage. When power was resumed I couldn't get to any website. I thought god, what's going on. I tested gateway was fine. Cloud flare and Google dns was reachable.
This lead me to my glinet box. Now trying to get a recovery going there is no img as discribe in the faq. There is only a bin file. When I uploaded this I get the error discribe here. I also tried the gpt update, no luck either it says upgrade successful.
I am trying to get support to engage but man... 2 brick already and I really wanted to skip all update because I had a bad experience before.
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After many attempts to fix the problem with support team, they decide to RMA and give-me a new one.
It was the first router that I couldn't unbrick, I've had many devices from other brands and I was always able to fix them using JTAG or other methods, but not this one. Let's hope the problem doesn't happen again.
Now fefore i do a upgrade i do a reset and a reboot before upgrade.
I tried multiple code versions and couldn't unbrick. I didn't run any custom code. This is my 2nd Brume that's bricked.
Support didn't even try to unbrick they offered a equivalent replacement.
I didn't argue and took the offer.
I've been going through the same problem for a couple of days now and must have gotten lucky with a fix. I've been getting update failed messages everytime I tried to debrick through Uboot. I even tried doing the gpt update (which wasn't failing) but couldn't get the firmware update to work.
Eventually, and because I read under another post that someone was checking their browser console to see what was happening under the hood, I thought maybe I should try and update through a different browser so I switched from Firefox to Chrome, did the normal update through Uboot and it was successfull! Connecting to 192.168.8.1 wasn't working after that (DHCP was still not giving me an IP address) so I thought maybe I should also try to do the GPT update as well. Did that, rebooted, switched to DHCP providede IP and it worked!
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I just came across this thread and read through all the great information provided. I also have a GL-MT2500A that has become bricked after trying to upgrade it to firmware version 4.6.8 through the remote UI in GoodCloud. The router was running as both a WireGuard and OpenVPN server.
Nether the Uboot (my system has U-Boot 2022.07-rc3 (Sep 12 2022)) firmware update to any of the last 5 release, or the GPT update has solved the problem. I have had this unit since February 2023 and all the while its operation and updates have been floorless.
I'll try the support team and see what they can offer, and post a follow up on any resolution.
GL has a a temporary test firmware for debug this, but not sure if can resolve or probably there are other bugs.
So, this firmware only test through email channels, small-scale testing, to verify whether what result is, collect validation data, we are no plan and will not test on a large scale.
If there is no problem with the validation test data, we will release the beta/stable firmware version for public.
In order not to expand the impact, we have to temporarily hide the post, truly sorry.
If you meet similar issue, please contact our technical team via email support@gl-inet.com. Thank you.