You can increase exposure in the raw converter one or two steps. So you if you needed 1/60, f2 and ISO 1250 you could try 1/60, f2 and ISO 320 and "overexpose" the underexposed photo in the software later. With the M8 you are quite limited. With my M8 I got sometimes nasty banding when I increase above 1 EV. Sometimes it worked. With the M9 I can increase up to 3EV without problems.