It
would appear that you made a mistake in setting your new combination on
your Master Lock 5400d and did not register the combination at Masterlockvault.com. The only way to open your lock is by using the
correct combination. There is no other way. Most mistakes are normally
one or two digits out, so you may wish to try variations on what you
thought you set.
Apart from that you can either try every possible combination or you will need to
contact the manufacturer. But they cannot assist you if the lock does
not have a serial number (they recently stopped applying serial numbers
for greater security) and they will not assist if the lock is already
secured to anything. There are a number of other hurdles as well, click here for details.
Given that they state that you will have to wait four to six weeks for
an answer, it's going to be far quicker to just try every possible
combination.
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