18F4550 to 18F2550

i try this code with 18F4550 and work 1000%
i change code for 18F2550 and not work, not Recognised

Resonator 4Mhz
4k7 in Mclr
470nf in Vusb
0,1nf in Vdd-Vcc

Vusb - 4550 = 3,31
Vusb - 2550 = 3,37

Code:

---

  '  =================
  asm
      __CONFIG    _CONFIG1L, _PLLDIV_1_1L & _CPUDIV_OSC1_PLL2_1L & _USBDIV_2_1L 
                              ;              ;                      ; USB clock source comes from the 96 MHz PLL divided by 2
                              ;              ; [OSC1/OSC2 Src: /1][96 MHz PLL Src: /2]
                              ; No prescale (4 MHz oscillator input drives PLL directly)


      __CONFIG    _CONFIG1H, _FOSC_XTPLL_XT_1H & _FCMEN_OFF_1H & _IESO_OFF_1H
                              ;                  ;              ; Oscillator Switchover mode disabled
                              ;                  ; Fail-Safe Clock Monitor disabled
                              ; XT oscillator, PLL enabled, XT used by USB
      __CONFIG    _CONFIG2L, _PWRT_ON_2L & _BOR_ON_2L  & _BORV_2_2L  & _VREGEN_ON_2L 
      __CONFIG    _CONFIG2H, _WDT_OFF_2H
      __CONFIG    _CONFIG3H, _MCLRE_ON_3H & _LPT1OSC_OFF_3H & _PBADEN_OFF_3H & _CCP2MX_ON_3H
      ;__CONFIG    _CONFIG4L, _STVREN_ON_4L & _LVP_OFF_4L & _ICPRT_OFF_4L  & _XINST_OFF_4L & _DEBUG_OFF_4L
      __CONFIG    _CONFIG4L, _STVREN_ON_4L & _LVP_OFF_4L & _XINST_OFF_4L & _DEBUG_OFF_4L
  endasm
 
  DEFINE OSC 48         
   
    '
    '  Hardware configuration
    '  ======================   
        '
        '  I/O and PORTs
        '  ------------- 
    PORTB  =  0
    PORTC  =  0
'    PORTD  =  0 ' enable for 18f4550
'    PORTE  =  0 ' enable for 18f4550
    TRISB  =  0
    TRISC  =  0
    TRISA  =  $FF
'    TRISD  =  0 ' enable for 18f4550
'    TRISE  =  0 ' enable for 18f4550

  ' USB modulo
  UCFG    var byte EXT        ' include UCFG register... Yeah Melabs didn't :o(
  ucfg    =  %00010100      ' enable internal USB pull-up, Full speed USB

  ' Interruptores
  INTCON  =  %10100000      ' Enable global and TMR0 interrupts
  T0CON  =  %10000000      ' TMR0, CLK internal, prescaler 1:2, T0ON

    ' 
    '  Variables & constants definition
    '  ================================
  I  Var Byte

  USBBufferSizeTX    con 8      ' input
  USBBufferSizeRX    con 8      ' output

  Usb_Contador        Var Byte    '
  Usb_Dados          var byte[8] ' store ADCs & pushButton data to send to USB

  ' Constantes
  TMR0IF              VAR INTCON.2 ' TMR0 overflow int flag
  TMR0ON              VAR T0CON.7  ' TMR0 on/off bit
  TMR0IE              VAR INTCON.5 ' TMR0 interrupt enable/disable bit

  ' Macros
  goto Configura

    asm
Reload_TMR0 macro
    BCF    _TMR0ON        ; stop timer
    MOVE?CW d'65000',TMR0L  ; reload for timebase ~100uSec
    BCF    _TMR0IF        ; clear overflow flag
    BSF    _TMR0ON        ; start timer
    ENDM
    endasm

'-------------------------------------------------------------------------------
Configura:
    pause 500
    usbinit
@  Reload_TMR0
    ON INTERRUPT GOTO Usb_Servico

'-------------------------------------------------------------------------------
Inicio:
  gosub Usb_Entrada
goto Inicio

'-------------------------------------------------------------------------------
Usb_Entrada:
  tmr0ie = 0
  Usb_Contador = USBBufferSizeRX

  USBService
  USBIn 3, Usb_Dados, Usb_Contador, Timeout
 
  GOSUB Usb_Saida
return
   
Timeout:
@  Reload_TMR0           
  tmr0ie = 1
return

'-------------------------------------------------------------------------------
Usb_Saida:
  TMR0IE = 0
 
WaitPC:
  'Usb_Contador = USBBufferSizeTX
 
  USBService
  USBOut 3, Usb_Dados, Usb_Contador, Waitpc
@  Reload_TMR0                                   
  tmr0ie = 1
return

'-------------------------------------------------------------------------------
DISABLE
Usb_Servico:
  usbservice
@  Reload_TMR0
  RESUME
ENABLE

---

for 18F2550 I use:

_CONFIG1H, _FOSC_HSPLL_HS_1H

Somehow strange... i posted examples of the USBDemo that worked on the following link.
http://www.picbasic.co.uk/forum/show...8&postcount=99

the whole set of config fuses for a 4MHz crystal was

Code:

---

    '
    '  Pic Configuration
    '  =================
    asm
    __CONFIG    _CONFIG1L, _PLLDIV_1_1L & _CPUDIV_OSC1_PLL2_1L & _USBDIV_2_1L 
                            ;              ;                      ; USB clock source comes from the 96 MHz PLL divided by 2
                            ;              ; [OSC1/OSC2 Src: /1][96 MHz PLL Src: /2]
                            ; No prescale (4 MHz oscillator input drives PLL directly)


    __CONFIG    _CONFIG1H, _FOSC_XTPLL_XT_1H & _FCMEN_OFF_1H & _IESO_OFF_1H
                            ;                  ;              ; Oscillator Switchover mode disabled
                            ;                  ; Fail-Safe Clock Monitor disabled
                            ; XT oscillator, PLL enabled, XT used by USB
                           
    __CONFIG    _CONFIG2L, _PWRT_ON_2L & _BOR_ON_2L  & _BORV_2_2L  & _VREGEN_ON_2L 
    __CONFIG    _CONFIG2H, _WDT_OFF_2H
    __CONFIG    _CONFIG3H, _MCLRE_ON_3H & _LPT1OSC_OFF_3H & _PBADEN_OFF_3H & _CCP2MX_ON_3H
    __CONFIG    _CONFIG4L, _STVREN_ON_4L & _LVP_OFF_4L & _XINST_OFF_4L & _DEBUG_OFF_4L
    endasm
    DEFINE OSC 48

---

Unless i need new glasses... can i suspect some wiring or device programmer problem?