What am I doing wrong? V41/HEPAX - ILper - DRIVE - HP-IL/HP41

[Artur - Brasil]

Dear HP-41 masters!

I'm trying to get the LIB4 into my HP-41CX with NovRAM module - I don't have the recorder.
So what I did:
1 - downloaded the LIB4 and others I need into my computer;
2 -installed them in my V41 emulator -all worked fine! (only HP-16C emulator did not work, so I removed it. Here the listing of HEPAX 002 in V41:
HEPAX 002
3:-EXT FCN 2D
4:-LIB#4 R58b.
5:-TIME 2C
6:-PRINTER 2E
7:-MASS ST 1H
8: HEPAX RAM
9: HEPAX RAM
A:-RAMPAGE'X
B:-ADV CONV B
C:`MATRX
D:-HEPAX 1D
E: NO ROM
F: NO ROM

3 - I copyed the ROM LIB4 into file LIB4 in the virtual cassete: ALPHA: LIB4 command: WRTROM;
wait ...

The DIR command results (in V41):
DIR
NAME TYPE REGS
BYTEG KE 1
CU PR 11
LINHA PR 75
LB PR 31
TSTTR PR 81
AUTO PR 63
SR PR 15
MAQELE PR 19
MAGN PR 68
SFTMEN PR 51
MAQAC2 PR 33
Y<>Z PR 21
TRAFO PR 48
MK PR 61
CPLX PR 96
MAQAC PR 157
CPYHEP PR 18
UNIT PR 105
UNIT2 PR 100
RCLHEP PR 13
FEN.TR AS 80
FEN.TR2 AS 40
MEC.SL AS 100
LIB4 DA 640

Excelent! So, I turned OFF V41, connected the real HP-41CX with HP-IL module and NovRam into PilBox and run the DIR command: result - exact as above - good!
So, I run HEPAX 002:
HEPAX 002
3:-EXT FCN 2D
4: NO ROM
5:-TIME 2C
6:-PRINTER 2E
7:-MASS ST 1H
8:`RCLHEP
9:`AUTO
A:`ELEC2
B: HEPAX RAM
C:-ADV CONV B
D:`MATRX
E:-HEPAX 1D
F: NO ROM

I need to put the LIB4 into port 4, correct? So, I did:
X: 4 alpha: LIB4
XEQ READROM

wait .....
H:CHECKSUM ERROR!

Please, what am I doing wrong?

Best regards
Artur