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ASUS RT-AX86U RT-AX88U 2048MB 2GB RAM

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chavo

Regular Contributor
made 2GB of RAM.

1) you need to replace 2 memory chips with DDR3 800 11-11-11
(DDR3L DRAM 8G, 1.35V, DDR3L, 512Mx16, 1600MT/s @ 11-11-11, 96-ball )
for example
MT41K512M16HA-107:A
MT41K512M16HA-125:A
IS43TR16K01S2AL-125KBLI (it is 2GB but works)

chips on taobao - https://item.taobao.com/item.htm?id=613596877778
on ali https://aliexpress.ru/item/32983556319.html
Screenshot from 2022-07-03 11-27-22.png


2) flash the modified firmware (editing mdtblock - the router will become a brick)
Screenshot from 2022-07-03 11-28-28.png


How to change another firmware so that 2GB works?

You need to compile the firmware, but before that change cfe
27150400000000004A01 replace with 27160400000000004A01
Code:
  cd ~/asuswrt-merlin.ng/release/src-rt-5.02L.07p2axhnd/targets/cfe/sysdeps/RT-AX86U
  sed -i 's/\x27\x15\x04\x00\x00\x00\x00\x00\x4A\x01/\x27\x16\x04\x00\x00\x00\x00\x00\x4A\x01/g' cfe4908.bin
  sed -i 's/\x27\x15\x04\x00\x00\x00\x00\x00\x4A\x01/\x27\x16\x04\x00\x00\x00\x00\x00\x4A\x01/g' cfe4908ram.bin
  sed -i 's/\x27\x15\x04\x00\x00\x00\x00\x00\x4A\x01/\x27\x16\x04\x00\x00\x00\x00\x00\x4A\x01/g' cfe4908rom.bin
  sed -i 's/\x27\x15\x04\x00\x00\x00\x00\x00\x4A\x01/\x27\x16\x04\x00\x00\x00\x00\x00\x4A\x01/g' precfe4908rom.bin

PS here on the RT-AC86U router https://www.snbforums.com/threads/rt-ac86u-1024mb-ram-support.69877/
PS0 4GB will not work
PS1 echo 70 > /proc/sys/vm/overcommit_ratio so that programs use more memory

md5: b61ddd0062090b2749a2f877dd35e960

Full memory dump
md5: 1a8029858ff127e4e34425afb9fb8a59
 
Last edited:

ASUS RT-AX88U 2048MB 2GB RAM​

md5: e1827d1fae9add50f94ccfb06f15fa35

Full memory dump
md5: a66e8e9e6ae27942efedcae6d1c94039

How to change another firmware so that 2GB works?

You need to compile the firmware, but before that change cfe
27150400000000003B01 replace with 27160400000000003B01
Code:
  cd ~/asuswrt-merlin.ng/release/src-rt-5.02axhnd/targets/cfe/sysdeps/RT-AX88U
  sed -i 's/\x27\x15\x04\x00\x00\x00\x00\x00\x3B\x01/\x27\x16\x04\x00\x00\x00\x00\x00\x3B\x01/g' cfe4908.bin
  sed -i 's/\x27\x15\x04\x00\x00\x00\x00\x00\x3B\x01/\x27\x16\x04\x00\x00\x00\x00\x00\x3B\x01/g' cfe4908ram.bin
  sed -i 's/\x27\x15\x04\x00\x00\x00\x00\x00\x3B\x01/\x27\x16\x04\x00\x00\x00\x00\x00\x3B\x01/g' cfe4908rom.bin
  sed -i 's/\x27\x15\x04\x00\x00\x00\x00\x00\x3B\x01/\x27\x16\x04\x00\x00\x00\x00\x00\x3B\x01/g' precfe4908rom.bin
 
Last edited:
This is exactly what I want for my mini NAS build. Can this be done by altering the official firmware? Or do I need to use Merlin? Thanks!
 
I did check the spoiler, I see a reference to the Merlin firmware, but I don't know if that's because OP likes Merlin or that it isn't possible to alter the original firmware.
modification of bytes in the firmware, not a fact that will help
modify cfe + compilation = work
Merlin's firmware contains information on the memory configuration for each router
in fact, modifying the cfe is a modification of the memory configuration for this router
 
Hello, I have bought the ASUS RT-AX88U, but the Pro version (RT-AX88U Pro), which has 1 GB RAM, but from what I have read it is DDR4.
I would like to upgrade it to 2Gb, is it possible? Which memory should I buy?
 
Welcome to the forums @VntValenzuela.

Not possible. Unless you have a very specific skill set(s).

 
you need to find out what kind of memory model is used there
to increase the memory you had to do two things: change the memory chip and change in firmware memory configuration
 
you need to find out what kind of memory model is used there
to increase the memory you had to do two things: change the memory chip and change in firmware memory configuration
Thanks, any suggestions on how to find the memory model? Or do I have to disassemble my router to see?
 


memory k4a4g165wf-bctd
 
and change in firmware memory configuration


memory k4a4g165wf-bctd
Thank you very much! I have found this memory:
https://www.datasheets.com/en/part-details/k4a4g165wf-bctd-samsung-electronics-409067952#overview
Which is made by Samsung will this do fine? It is 4Gb
 
Be sure the RAM capacity is within the limits of the SoC you're trying to attach it to. I believe 4GB is beyond that limit.
 
The router has 2 k4a4g165wf-bctd chips, 512 MB each (256M x 16). To increase it, you probably need 512M x 16 or 1G x 16 or 2G x 16. Theoretically, 8GB can be supplied. I looked at the sources. It’s not immediately clear what code is responsible for the memory configuration. The configuration is different from DDR3 memory. The configuration file is asuswrt-merlin.ng/release/src-rt-5.04axhnd.675x/shared/opensource/boardparms/bcm963xx/boardparms_4912.c. There is a similar router gt_axe16000_2gb with 2 GB of RAM. You can understand it with an example.
 
Thanks very much, I will try my best regarding de SoC which is Broadcom BCM4912 I couldn't find the RAM capacity limits.
The router has 2 k4a4g165wf-bctd chips, 512 MB each (256M x 16). To increase it, you probably need 512M x 16 or 1G x 16 or 2G x 16. Theoretically, 8GB can be supplied. I looked at the sources. It’s not immediately clear what code is responsible for the memory configuration. The configuration is different from DDR3 memory. The configuration file is asuswrt-merlin.ng/release/src-rt-5.04axhnd.675x/shared/opensource/boardparms/bcm963xx/boardparms_4912.c. There is a similar router gt_axe16000_2gb with 2 GB of RAM. You can understand it with an example.

 

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