Shave or cut hair umrah

Asalaamalaikum My question is regarding to extent of cutting/shaving hair as per 4 fiqh's. I did my first Umrah and used zero trimmer to remove all hair. After 2-3 days i did second Umrah and used same zero trimmer and removed hair all over head whatever i can. Is this correct or do i have to pay dum? I had checked with local imams and they said it is okay as trimming is also permissible and you removed whatever is possible but it is better to shave with blade. Later, i used to shave at barber shop for my next umrah's.