what to do if they say jari x lulus...fingerprint not pass or something like that...do i have to queue like normal walk in? or can just skip queue and nego with the officer?

Just to update on my experience.

After getting email from imi regarding jari tidak sah, and no option to set appointment, i just went to the UTC i originally chose online.
Went to counter, passed my printed receipt, IC and old passport. they gave me a queue number (separate from normal walk in queue number).
Wait about 10-15 mins, and queue number called. did all the normal stuff at counter, no need take picture. Then told me wait for collection counter. That took about extra 45 mins.
So in the end, about 1.5 hour at the office la I guess.

all in all, i'd say better to submit online instead of walk in if you're not senior citizen, cos the queue is cibai even on normal workday. Nasib baik my online queue is separate. I didn't have to queue early, just go at 10am when road no jam.

For photo submission, i just use my normal ipong. Applied 3.5x5 scale crop using photochop, and apply layer mask so the background is all white. #cheapskate version