Hi, I have a question about installing openwrt on TP-LINK TL-MR6400 V5.3. I see that the V5.0 version has OpenWRT support but I am interested if anyone has tried to install this firmware on a V5.3 router? My company uses this software on routers and I am looking for a replacement for my customers' current hardware. As I only have access to V5.3 I urgently need to know the answer regarding openwrt support for this model.
Thank you in advance for your help.
Same question here. Any answers?
ver Y.x is usually ver Y.
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Update: I’ve installed latest version for v5.0 on my v5.3 and it works without any problem 
Not sure if this is the right place to post this...
I installed OpenWrt on v5.2 and noticed it has only 2 MB of flash... the Wiki stated 8 MB for version 5.
I actually planned to install an openVPN client but with 2 MB that's not gonna work out 
Tought I leave this info here in case someone else stubles across it.
8mb is the total capacity, where do you think Openwrt sits ?
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So I guess this means the numbers shown in LuCI are indicating the remaining space?
In case yes, is there any chance I can shrink the OpenWrt install by ~0.5 MB? I think this could be sufficient to install OpenVPN.
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Correct.
If you don't need PPPoE, you could remove all ppp* packages in image builder, and add openvpn through it too.
https://firmware-selector.openwrt.org/?version=23.05.3&target=ramips%2Fmt76x8&id=tplink_tl-mr6400-v5
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That would be great, thanks a lot @frollic
I will give it a try 
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@frollic I have tried a build without PPPoE, but it only gives me additional ~120 KB... would you have another idea what packages could be omitted?
I e.g. think I will not need IPv6
The router will be standalone and only connect to 1-3 devices. I just need WiFi and openVPN.
Don't know how openwrt will behave if you remove the two ipv6 DHCP packages, but you can always try.
Isn't Wireguard an option, I think it's smaller than OpenVPN ?
Are you planning on using the modem ? If not, then you can remove the USB packages.
I have an OpenVPN server already running, so this is why I would prefer it. I am using the modem if this refers to using a sim card for internet access.
I will give removing IPv6 DHCP a try 
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Doubt they will give you the extra space, but it's worth trying.
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You were right, they did not give a recognizable amount of extra space...
wireguard is much smaller than OpenVPN…
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For the archives, I installed OpenWrt without LuCI which left enough space to install the OpenVPN client.
I couldn't do this. Could you please guide my how to install it in my MR6400 (EU) v 5.3?