Has your GDK-16D, A or E, GDK-34, GDK-34i, GDK-100, GDK-186, LDK-20, LDK-100, LDK-300 and GSX system forgot its programming after powercut?
Does your iPECS MFIM50A, B or MFIM100 keep defaulting back to Korean after resetting or power cut?
If so your 3.6V Lithium 1/2 AA battery requires replacement.
These batteries are £5 - £8 each new for a top brand like Varta or Sonnenschein.
Cheaper batteries don't last long at all, the original Tekcell are oftern flat within a couple of years.
Please note that some boards like LDK-100 MPB may have daughter board called a MEMU fitted this will also require the battery changing.
Contact me for pricing and or for a battery fitting service via link bottom left.