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You can find SD cards for a number of different retailers. I have used Amazon before, you can also do a Google search to find probably 30 different vendors that have these cards. Average price is about 50 cents US per Gigabyte of size.
I have a nextar 14-bc and I was having similar problem and I found that the power in jack had a broken solder joint and when I thought it was charging it was not. I would not turn on until I discovered the broken solder joint inside on the power jack. I resoldered it and after it charged up it was up and working again. You might check on that.
Unfortunately Nextar does not offer an update for your unit. See units with available updates below.
Map Upgrades for GPS: The below units are upgradable with theNavi Extra maps.
Q4: From Serial #ML0909020001 onwards. From Serial #YF0909123953 onwards
Q4-06: From Serial # ML0909000001 onwards
ME: All serial numbers
43LT: All serial numbers
V4: All serial numbers
V5: All serial numbers
I4-BC: From Serial# ML1004000001-ML1004000504 and ML1005001701-ML1005002700
Important Map Upgrade Information: Please note that refurbished units that have serial numbers starting with MLR or ML999 are not compatible with map upgrades. Navi Extra Mapping Please note that Nextar is unable to answer map support questions once the Navi Extra mapping has been purchased. For any map related questions and/or refunds, please feel free to contact Navi Extra at:https://nextar.naviextras.com/shop/portal/support?selectedTab=contactus.
To update the existing map for you Nextar product, please
contact Nextar to find out if any new map information has become
available. Nextar products are usually pre-loaded with USA/Canada maps,
depending on the model. If you need updates
I just opened up a Nextar 14-BCT GPS unit and found the inner side of the ribbon cable is cracked. This unit has the exact same freeze on load screen as you do, so try looking inside, you may need the LCD ribbon cable or both LCD and LCD ribbon cable for your unit to function normally again.