As he read through the forum post, John noticed that the crack was allegedly provided by a well-known hacking group. The group claimed that they had found a vulnerability in the RouterOS licensing system and had created a patch to bypass it.
It wasn't long before John's suspicions were confirmed. He discovered that the crack had indeed installed a backdoor, which allowed the hacking group to access any router running the cracked software.
John decided to recommend that the ISP invest in legitimate RouterOS licenses. He explained the risks of using cracked software and the potential consequences of a security breach.