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Source
Interstellar Species pg. 127
You’ve built in a receiver for spell chips. You can insert a number of spell chips equal to half your level. Using these spell chips has the same requirements as normal. Because you have the chips linked in an array, you can expend a spell chip to cast a spell on any other spell chip you’ve inserted of the same or higher spell level. A spell chip array is difficult for creatures not aware of it to locate; someone performing a close inspection can discover it with a successful Mysticism or Perception check (DC = 10 + your total Engineering skill modifier).
This trick can be taken only by characters who can be targeted by effects that only affect constructs, including those of the construct type and those with the constructed species trait.
As written, is sounds like you could indeed 'consume' a level 1 chip to cast a 6th level spell from another chip in the same array, but I'm assuming that is not how this trick was intended: If nothing else, it doesn't make much sense to me that you could use a Comprehend Languages chip to cast Disintegrate but not vice-versa...
I'm guessing it was supposed to be written as:
'you can expend a spell chip to cast a spell on any other spell chip you’ve inserted of the same or higher lower spell level.'
This give you increased flexibility with your chip usage and allows you to consume chips you otherwise never intend to use in a useful fashion, which seems about right for a level 2 trick.
Replacing a spell chip is presumably a 'downtime' activity, but the actual rules on spell gems/chips are kinda vague at best.