Changes

Test ("Panda") units with the same prefix as retail can be distinguished by test units having 00 or 01 as the first two digits of the serial number portion.  00 was used with the New 3DS and New 3DS XL for test units; 01 was used with the New 2DS XL test unit.  Preview versions of the N2DS XL given out to the press had 01; these appear to have been test units with the development titles deleted.

Test ("Panda") units with the same prefix as retail can be distinguished by test units having 00 or 01 as the first two digits of the serial number portion.  00 was used with the New 3DS and New 3DS XL for test units; 01 was used with the New 2DS XL test unit.  Preview versions of the N2DS XL given out to the press had 01; these appear to have been test units with the development titles deleted.

Old 3DS development systems (Partner-CTR, IS-CTR-BOX, IS-SPR-BOX) use the "E" and "R" prefixes like test systems, but have 90 (Partner-CTR) or 91 (IS-CTR-BOX, IS-SPR-BOX) as their first two digits.  It is currently unknown what is the serial number format of New 3DS development systems (IS-SNAKE-BOX, IS-CLOSER-BOX).

Old 3DS development systems (Partner-CTR, IS-CTR-BOX, IS-SPR-BOX) use the "E" and "R" prefixes like test systems, but have 90 (Partner-CTR) or 91 (IS-CTR-BOX, IS-SPR-BOX) as their first two digits.  Similarly, the main New 3DS development unit, IS-SNAKE-BOX, uses the Y prefix (same as retail) with 91.  It is currently unknown what is the serial number format of the rare New 3DS XL development system (IS-CLOSER-BOX).

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