Electrum creates 20 addresses by default. I created an address at high index(about 50,000) by script and sent some bitcoin to the address.

The amount of bitcoin doesn't present in my account balance because electrum only searches for balance for the first 20 addresses(index 0-19).

I tried to change the gap_limit to 50000 to make electrum searching for more, but electrum got frozen for hours and unresponsive.

So how can I access the missing bitcoin? Than you in advance.