Why can’t the code be changed to make more than 21 million BTC ?

Why can’t the code be changed in BTC in order to mine more ?

ELI5 please

Why can’t more then 21 Million BTC ? Trying to explain to a friend and they keep saying code can be changed , hacked, altered etc.

Thanks !

Also if someone could ELI5 why a fixed supply will ultimately make the price explode ? ELI5 once again please

submitted by /u/Purple1Rain
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