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Esc Replacement question

#1
Hi there, Im looking to replace a burnt out esc on my quad but the signal wires dont work normally. the quad is a floureon racer 250. The problem is that the signal wire is not directly soldered into the flight computer like normal, and there is no grounding wire. instead they are soldered onto the body of the quad which acts like the pdb. the replacement escs that i bought have the standard ground and signal wires. am i ok to cut the ground wire off the new escs completely and only solder on the new signal wire, or should i try and replace all the esc and re route them to the flight computer? What should i do?

https://drive.google.com/open?id=1JC-piia9ZfP-Zo865V2ZpZgdqs82yojC

here is the link to the pictures in my drive as they were too large to share on here.