Please note that my question is in addition to following question: How do I decrease the difficulty on a private testnet?. I am sorry that, I am lost in its answers.
[Q] Is it possible to decrease difficulty of ongoing private Ethereum blockchain (for example: blockchain already mined 491,312 number of blocks)? or should I create a new private Ethereum blockchain from 0th block to alter the difficulty?
I have applied @eth's solution https://ethereum.stackexchange.com/a/7159/4575 on my
enode and released that difficulty is started to decrease, but I was not able to mine any of my upcoming transactions due to following error and so on:
Bad block #491231 (0x39e86646d54ad4a83ba41abc1192fb8e64bfcbf733aa2e5e94351fd168091068) Difficulty check failed for header 914854
In addition to that, I was not sure to apply this solution on all nodes that are connected to me private ethereum network? or only on the enode that the peers connected into?
Thank you for your valuable help and time.