With 5x5 you simply add 2.5kg to the bar after every session. You do this until you can't complete 5 sets of 5 reps.
In this case you just drop the weight 2.5kg and do 5x5 the session after. Next session you put 2.5kg on again. If you can't do 5x5 again repeat.
E.g.
Squats @ 50kg
set 1: 5 reps
set 2: 5 reps
set 3: 5 reps
set 4: 4 reps
set 5: -2.5kg - 5reps
next session do 5x5 with 47.5kg
next session try 5x5 with 50kg again.
Follow that with 5x5 and don't change the exercise or rep range, its like that for a reason.
In this case you just drop the weight 2.5kg and do 5x5 the session after. Next session you put 2.5kg on again. If you can't do 5x5 again repeat.
E.g.
Squats @ 50kg
set 1: 5 reps
set 2: 5 reps
set 3: 5 reps
set 4: 4 reps
set 5: -2.5kg - 5reps
next session do 5x5 with 47.5kg
next session try 5x5 with 50kg again.
Follow that with 5x5 and don't change the exercise or rep range, its like that for a reason.