If your LP-5231 is equipped a 256 MB flash memory, please try "lp5231_1.0.tgz".

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A partitioned MTD device can be depicted as below (user can be found from /proc/mtd), which shows the relation between an MTD device, a partition and size.
Here is a result of 512 MB flash memory:
root@LP-5231:/proc# cat   mtd                                                    
dev:         size      erasesize    name                                                 
mtd0: 00040000  00040000   "SPL"                                                  
mtd1: 00040000  00040000   "SPL.backup1"                                          
mtd2: 00040000  00040000   "SPL.backup2"                                          
mtd3: 00040000  00040000   "SPL.backup3"                                          
mtd4: 003c0000  00040000   "U-Boot"                                               
mtd5: 00040000  00040000   "U-Boot Env"                                           
mtd6: 00500000  00040000   "Kernel"                                               
mtd7: 1f600000   00040000   "File System"                                          
root@LP-5231:/proc#