Here is Mega Man 4 Ridley X Hack 6 Dr. Cossack's Revenge in a Normal Mode.
This hack is easier than the original hack and has some changes.
Have fun!
Megaman 4 (U) (PRG0) [!].nes - GOODNES 3.14
CRC32: ADBD4E48
MD5: 7521EB54199F73CB04E1CCDD15CA971D
SHA-1: 2AE9A049DAFC8C7577584B4B9256F7EF8932B29C
SHA-256: E4105D20F6B2E8F16317B173BD4DE96DCA0D102C225959C073A9E8C673E59D33