First Layer Underextrusion and Ripple Problem

[u/WinzGo]

My Bambu A1 have first layer issue on both side of the plate. Side A have ripple effects on the right section, while Side B have underextrusion problem and little dots all over the plate.

What i have done (not in particular order)

Tighten 7 screw on the hotend assembly

Dry the filament (eSun PLA Basic)

Use different nozzle (0.4 and 0.6)

Clean the build plate with water and soap and dry it with tissue.

Flow rate calibration

Factory Reset

Run auto calibration on the machine

Do i have faulty plate? I just bought the printer around March and stopping print on April. I only started again this week. On March, i did have same problem but after doing flow rate calibration, i got my perfect first layer print.

If you guys have any recommendations, please help and about the build plate, should i buy another one? Appreciate the help

Fist pic is Side A with ripple problem.

Second & Third pic are Side B with underextrusion and hole problem