FHA loans provide huge support for the first-time homebuyers by offering mortgage loans with minimum down payment. Still it does not mean they are only meant for the first-time homebuyers, read about it here. That is the main benefit, which makes many applicants qualify for the program.
The main problem for potential homeowners would be that recent changes in policy may cause some difficulties for those who have a questionable credit history.
The potential borrowers who are interested in assigning for an FHA loan must have a minimum FICO score of 620 to qualify for the low down payment preference, which is currently about 3,5%.
Anyway, in case of lower credit score you still might be eligible for the program. Just get to know where to get an FHA home loan with bad credit. The homeowners-to-be with the score below 580 will have to put down a 10% down payment if they want to qualify for a loan.
Consider all advantages and disadvantages of paying a larger down payment before buying a house. Sometimes it is reasonable to put some money to increase the credit score first.