As a consumer, when sign up for a loan agreement, it fixed 1 thing, which is the X% BLR -/+X% or BR +X%

Upon the time of loan offer, the effective landing rate look the same.

1. About impact on BLR
Before BR take effective
BNM decide the BLR, your agreement fixed X%
After BR take effective, does BNM still decide BLR or bank can decide base on BR calculation?

e.g. BLR 6.85 - 2.4%, so is BLR still same in future for all bank or each have different BLR?

The obvious of this question is does it matters which bank i get my loan from as long as the offered -2.4% is the best rate i get?

2. For BR rate
BR rate is base on banks performance, but you loan agreement only fixed on the margin %.
If i got an offer from HSBC 3.9+0.65%, MBB 3.2+1.3%
In a long run, if HSBC able to increase cost effective become 3.5+0.65% (since 0.65% is fixed)
and if MBB not doing well, example it become 3.5+1.3%?

At this point of time, they might able to offer new loan rate e.g. both also 3.5+1%

But for those who already signed the agreement, isn't their fate is tied to the performance of the bank for the rest of the tenure?

I meant the blr 6.85% as off every bank refering the same rate? not the after offer rate