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I have a board with PIC32MX795F512L. The board icsp connector is connected to PGEC1 (pin 24) and PGED1 (pin 25). I accidentaly flashed a hex bootloader (i don't have the source code) used for another project. This bootloader moves programming pins to PGEC2 (pin 26) and PGED2 (pin 27). So now I can't program the pic32 anymore using MPLAB IPE; i can only flash an hex using the bootloader + usb method.

Which code should I write to change PGEC2/PGED2 back to PGEC1/PGED1?

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Reset to default
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You should write bit 3 ICESEL of the DEVCFG0 register to zero, according to the datasheet. enter image description here

Here you have some information regarding how to self-write the DEVCFG registers, which is otherwise normally only written by the programmer: https://forum.microchip.com/s/topic/a5C3l000000MaS3EAK/t370179

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