I hope this is the right place.
I came across a video on youtube showing an Arduino nano that the author changed to an Arduino uno by installing a new bootloader. Is that possible? I can add the link if that's allowed.
Yes links are allowed. However there is little difference between a Nano and a Uno and a boot loader makes little difference to anything.
What do you think a Uno has over a Nano?
Grumpy_Mike:
What do you think a Uno has over a Nano?
An inch. 
Grumpy_Mike:
What do you think a Uno has over a Nano?
Optiboot vs. old bootloder = 1536 bytes more available program memory:
uno.upload.maximum_size=32256
uno.bootloader.file=optiboot/optiboot_atmega328.hex
nano.menu.cpu.atmega328.upload.maximum_size=30720
nano.menu.cpu.atmega328.bootloader.file=atmega/ATmegaBOOT_168_atmega328.hex
Well if you need that extra program then load it in. Personally I run out of SRAM long before I run out of program memory. The processor of the two Arduinos is the same. The only diferance is the package, this pins out the two extra analogue input pins A6 & A7 on the Nano.
I found this on youtube. Quite fascinating to say the least.
Thanks for that. I have not seen that sort of LED before.
This difference is quite significant even when you don't need the extra program space:
uno.upload.speed=115200
nano.menu.cpu.atmega328.upload.speed=57600
oqibidipo:
This difference is quite significant even when you don't need the extra program space:
No it’s not, you would hardly notice it.