Check compadiblity first
LTR-0841-->LTR-12101B: possible, sanyo chipset
LTR-12101B: Not upgradable, sanyo chipset
LTR-12102B: Not upgradable, mediatek chipset
LTR-12101C-->LTR-16101B: maybe possible?, sanyo chipset
LTR-12102C: Not upgradable? mediatek chipset.
LTR-16101B: Not...