Accu-Chek Aviva Owner's Booklet page 16

NOTE.
• Don't force the code key into the meter. It is made to go into the meter only one way.
• If "code" and a flashing "‑ ‑ ‑" are displayed, turn off the meter and reinsert a code key into the meter.
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4. Turn over the code key so the code number faces
down. Push the code key into the code key slot
until it stops.
5. Leave the code key in the meter until a new box
of test strips is opened. Change the code key
each time a new box of test strips is opened.