Hello everyone, I installed the 128MB memory (W25Q128FVSIG) on my Re450 V2. First I copied the dump file from the 64MB and then wrote it to the 128Mb Everything works as before, but the memory has remained the same. What should I do to make it recognized?
Is a flash chip, not a memory chip.
Search the forum for flash upgrade.
W25Q128FVSIG is 128Mbit flash memory chip, so you should use lowercase b.
It's organised as "16MB x 8".
You need to adjust the dts file for your router and build your own image.
The current 8MB flash layout is explained on the device page:
from what I've read I should upgrade from 8MB to 16MB how?
... forever.
I don't understand how I have to merge the dump file?
You have to alter the layout, and change the DTS file so it matches the new layout.
Did you read the thread you were given ?
I would need a more detailed guide
could I upload the file if someone will do it for me?
This is something you should be doing yourself. The main reason here is that it is not a one-off deal. You'll need a new bespoke image for your router each time there is an update available. So you should become comfortable building OpenWrt from source.
You only need to modify the DTS file once and then you can reuse that file for each subsequent build. But the build process will be repeated each time you upgrade.
so for each update I have to unsolder the chip?
No.... you're done with the hardware modifications.
For each update, you need to compile your image from source code.
I don't understand how to do it, I'm not familiar with this thing
I should see it to be able to do it
I provided links to the build system and the details about the DTS file (across the other 2 links).
Did you read those? Yes, there's a lot there and it has quite a steep learning curve.
Why did you replace the flash chip if you're not familiar with this? We you under the impression that the standard image would be able to utilize the larger flash chip? If so, unfortunately you were mistaken.
You can continue to use the standard images, but they won't take advantage of the extra space on the chip... you'll be limited the same as you were before you did the chip swap.
If you want the new space to be useful, you must build images from scratch, using the tools described in the links I provided.
Keep in mind you might have to move some of the mtds to the (new) far end of the flash, to be able to utilize the additional free space.
This is the reason why you need to modify the DTS.
so I don't know where to start I want to learn this thing 
Start by reading the links I provided.
Then build firmware for your device from scratch and install your own self-built image. Once you’ve learned how to do that, edit the dts file and build again.
What is the procedure for using Linux?