1110 is not 0x70 in Hex, it’s 0x0E. And the OCCON value is not 1110.
If you read the datasheet on page 28, the value of OSCCON register should be:
bit 0 and 1= 11 or 10 (to select internal oscillator).
bit 2= 1: (frequency is stable)
bit 3=0 Device is running from the internal oscillator
bit 6 to 4 =110 To select 8 MHz
So the OSCCON value will be: 1100111 in binary or 0x67