Find the nearest Mexican Consulate to you and go to their webpage. At least here in the US, they are very good about answering e-mails. In fact, when we did our permanent residency in October, we were able to send photos of all of our paperwork to the man who processed it in advance, so that when we arrived, we had EXACTLY what was required. It took an hour each in the US, and two 20 minute visits to the immigration office where we decided to do our paperwork in Mexico, and that was it. The visits were 3 days apart, and we were handed our residency cards. Paying the fee at the bank took longer than the process in Mexico.
Seriously, since the changes in 2013, you MUST start the process in your home country. All the information you provide there is sent electronically, so you don't have to do it all again.
Want to know more? Check this......
http://www.zihuatanejo.net/tablero/index.php?mode=entry&id=107127
http://www.zihuatanejo.net/tablero/index.php?mode=entry&id=108744
Part 4 isn't on line. We went back to the office after receiving an e-mail two days later, were handed our Permanent Residency cards, congratulated, and invited to the once a year reception for new residents in Ixtapa. That's it. We are Permanent Residents of Mexico. No renewing, nothing. We are done.
