Ram/Nand Flash modules on motherboard.

Hello, I am a computer engineering student and I have been working on trying to figure out this information for a while now. What FBGA does the the S20 ultra 5g use. I have been trying to figure out if it is technically feasible/possible to upgrade a 128gb storage with 8gb ram or lesser phone to a 512gb/16gb with the right NAND and LPDDR5 modules.

Why am I going this far, I posted a while ago on Samsung members that they need to bring back features like the expansion slot stop taking away features and sensors they have on devices. A flagship is the Pinnacle of technology for that company and should keep growing. If they didn't do it in the next 3-4 generations (knowing that phone cycles are years so the peoples suggestion would take time to bring back). I would not upgrade and they would most likely lose a life long customer (first Samsung at 12 now 25+). Well they deleted it after it started to gain traction. Since, 512gb models are rare but not 128gb models and open source phones don't have there quality I need or storage. I need to see if it is possible to upgrade the 128 to 512gb and have them work. Hopefully, they bring it back or I will have to follow through on making my own open source project just to have a flagship again.

I have a strong belief in owning your data on your device and not using/trusting someone else to hold it for you. Also, while connectivity is improving you can't always connect to the cloud to access gigs or terabytes of photos. If SD cards are to slow then the technology companies should band together in a consortium to make a new open standard like they did several times in the past ie(USB, Bluetooth, Wi-Fi,nvme, thunderbolt) this standard should be removal and would faster and fits in mobile devices. If they don't like something. I only say this because the public reason they removed the card was it's speed and reliability. Add a disclaimer that encourages cloud services for backup if SD or new standard is USD to protect data and you protect your liability and partnership with the cloud providers. innovation is the key to advancement and we are stepping backwards for convince and to save a dollar here or there when it harms progress.

Sorry about going off question a little bit but I wanted my thoughts somewhere they might/would be appreciated.