Hoping someone can help me with this. I ordered a Sensah SRX 1x12 speed groupset from Aliexpress. Unfortunately it arrived with an 11 cog cassette, and I then also noticed that the left shifter only has 11 positions configured. Their agent says they just shipped me the wrong pack from the warehouse and suggest I return it...

I'm wondering if this shifter can be configured as either 11sp or 12sp. From what I can tell, this is definitely the 12 speed shifter (it has the G12 decal similar to other 12sp listings for this model) so I'm wondering if there is a screw or something I can adjust to enable the 12th position. This took ages to deliver and I really don't want to send it back and order again, it took many weeks to arrive in the first place... I'd rather just buy a 12sp cassette separately.

Appreciate any help with this...


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Edit: sorry perhaps this should have been in the Maintenance board... live and learn...