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 upgradable, sanyo chipset
LTR-16102B: Not upgradable, mediatek chipset
LTR-16102C-->LTR-24102B, possible, mediatek chipset.
LTR-24101B: Not upgradaple, sanyo? chipset?
LTR-24102B: Not upgradable, mediatek chipset.
LTR-24103S-->LTR-32123S: possible, mediatek chipset.
LTR-32123S: Not upgradable!, mediatek chipset.
LTR-32125W-->LTR-48125W, possible, mediatek chipset.
LTR-40125S-->LTR-48125W, possible, mediatek chipset.
LTR-40125W-->LTR-48125W, possible, mediatek chipset.
LTR-48125W: Not upgradable, mediatek chipset.
LTR-48126?-->LTR-48246?, most likely possible, mediatek chipset.
LTR-48166?-->LTR-48246?, most likely possible, mediatek chipset.
LTR-48126?-->LTR-52326?, Maybe possible?, mediatek chipset.
LTR-48166?-->LTR-52326?, Maybe possible?, mediatek chipset.
LTR-48246?-->LTR-52326?, Maybe possible?, mediatek chipset.
LTR-52326?: Most likely not upgradable, mediatek chipset.
LTD-163: Not upgradable, mediatek chipset.
LTD-163D: Not upgradable, mediatek chipset.
LTD-165H: Not upgradable, mediatek chipset.
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 upgradable, sanyo chipset
LTR-16102B: Not upgradable, mediatek chipset
LTR-16102C-->LTR-24102B, possible, mediatek chipset.
LTR-24101B: Not upgradaple, sanyo? chipset?
LTR-24102B: Not upgradable, mediatek chipset.
LTR-24103S-->LTR-32123S: possible, mediatek chipset.
LTR-32123S: Not upgradable!, mediatek chipset.
LTR-32125W-->LTR-48125W, possible, mediatek chipset.
LTR-40125S-->LTR-48125W, possible, mediatek chipset.
LTR-40125W-->LTR-48125W, possible, mediatek chipset.
LTR-48125W: Not upgradable, mediatek chipset.
LTR-48126?-->LTR-48246?, most likely possible, mediatek chipset.
LTR-48166?-->LTR-48246?, most likely possible, mediatek chipset.
LTR-48126?-->LTR-52326?, Maybe possible?, mediatek chipset.
LTR-48166?-->LTR-52326?, Maybe possible?, mediatek chipset.
LTR-48246?-->LTR-52326?, Maybe possible?, mediatek chipset.
LTR-52326?: Most likely not upgradable, mediatek chipset.
LTD-163: Not upgradable, mediatek chipset.
LTD-163D: Not upgradable, mediatek chipset.
LTD-165H: Not upgradable, mediatek chipset.