Hello @saibankan1045, thank you for your comment and question! In my particular model of Thinkpad T14 Gen 4, the RAM is upgradeable. However, since I already have enough RAM, an upgrade was not necessary for me. There are different variants of the T14 Gen 4: some have soldered RAM, while other models have removable RAM. Therefore, it is important to check the specifications of your specific model to make sure if an upgrade is possible. The best way to do this is to carefully unscrew your device and see if there is a RAM slot, as shown in the video.
Wow this video was one of the more comprehensive ones ive seen regarding building custom keyboards! quick and easy! Maybe you couldve given us some more detailed footage of you doing the steps instead of only running it on a timelapse. Other than that great Video Sir. Subbed!